diff --git a/markbase-core/Cargo.toml b/markbase-core/Cargo.toml
new file mode 100644
index 0000000..0425738
--- /dev/null
+++ b/markbase-core/Cargo.toml
@@ -0,0 +1,57 @@
+[package]
+name = "markbase-core"
+version = "0.2.0"
+edition = "2021"
+
+[dependencies]
+# === 核心压缩库（Phase 1基础）===
+zip = "0.6"              # ZIP格式（稳定版本）
+tar = "0.4.46"           # TAR格式
+flate2 = "1.1"           # GZIP格式（已有）
+
+anyhow = "1"
+axum = { version = "0.7", features = ["macros"] }
+bcrypt = "0.16"
+chrono = { version = "0.4", features = ["serde"] }
+clap = { version = "4", features = ["derive"] }
+dav-server = "0.11"
+filetree = { path = "../filetree" }
+futures-util = "0.3"
+log = "0.4"
+env_logger = "0.11"
+markbase-webdav = { path = "../markbase-webdav" }
+pulldown-cmark = "0.12"
+rusqlite = { version = "0.32", features = ["bundled"] }
+sled = "1.0.0-alpha.124"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sha2 = "0.10"
+hmac = "0.12"
+base64 = "0.22"
+tokio = { version = "1", features = ["full"] }
+tokio-postgres = "0.7"
+russh = "0.61.2"
+russh-keys = "0.50.0-beta.7"
+russh-sftp = "2.3.0"
+ssh2 = "0.9.4"
+ssh-key = "0.7.0-rc.10"
+rand = "0.8"
+axum-extra = { version = "0.9", features = ["multipart"] }
+tokio-util = { version = "0.7", features = ["io"] }
+toml = "0.8"
+uuid = { version = "1", features = ["v4"] }
+dashmap = "6.1"
+md5 = "0.8"
+adler = "1.0"
+byteorder = "1.5"
+x25519-dalek = "2.0"
+ed25519-dalek = { version = "2.0", features = ["rand_core"] }
+aes = "0.8"
+ctr = "0.9"
+
+[dev-dependencies]
+tempfile = "3.12"
+
+[[bin]]
+name = "markbase-core"
+path = "src/main.rs"
diff --git a/markbase-core/src/archive/config.rs b/markbase-core/src/archive/config.rs
new file mode 100644
index 0000000..cc50376
--- /dev/null
+++ b/markbase-core/src/archive/config.rs
@@ -0,0 +1,169 @@
+// Archive Configuration - User Configurable Options
+
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+
+/// Archive Configuration
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ArchiveConfig {
+    // Optional formats (controversial)
+    pub enable_rar: bool,    // ⚠️ Legal risk (RARLAB patent)
+    pub enable_xz: bool,     // ⚠️ External dependency (liblzma)
+    pub enable_7z: bool,     // ⚠️ Unstable library
+    
+    // Performance settings
+    pub cache_size_mb: u64,
+    pub max_concurrent_extractions: usize,
+    
+    // Security settings
+    pub max_decompression_ratio: u64,
+    pub max_file_size_mb: u64,
+}
+
+impl Default for ArchiveConfig {
+    fn default() -> Self {
+        Self {
+            // Optional formats (default disabled)
+            enable_rar: false,
+            enable_xz: false,
+            enable_7z: false,
+            
+            // Performance
+            cache_size_mb: 100,
+            max_concurrent_extractions: 4,
+            
+            // Security
+            max_decompression_ratio: 1000,
+            max_file_size_mb: 1024,
+        }
+    }
+}
+
+impl ArchiveConfig {
+    /// Load configuration from TOML file
+    pub fn load(path: &str) -> Result<Self> {
+        let content = std::fs::read_to_string(path)?;
+        let config: ArchiveConfig = toml::from_str(&content)?;
+        
+        // Validate configuration
+        config.validate()?;
+        
+        Ok(config)
+    }
+    
+    /// Save configuration to TOML file
+    pub fn save(&self, path: &str) -> Result<()> {
+        let content = toml::to_string_pretty(self)?;
+        std::fs::write(path, content)?;
+        Ok(())
+    }
+    
+    /// Validate configuration
+    pub fn validate(&self) -> Result<()> {
+        if self.cache_size_mb > 1000 {
+            warn!("Cache size > 1GB may cause memory pressure");
+        }
+        
+        if self.max_concurrent_extractions > 10 {
+            warn!("Concurrent extractions > 10 may cause resource exhaustion");
+        }
+        
+        if self.max_decompression_ratio < 10 {
+            return Err(anyhow::anyhow!("Max decompression ratio too low (min 10)"));
+        }
+        
+        if self.max_file_size_mb > 10_000 {  // 10GB
+            warn!("Max file size > 10GB may cause disk space issues");
+        }
+        
+        Ok(())
+    }
+    
+    /// Generate default config file template
+    pub fn generate_template() -> String {
+        let config = Self::default();
+        
+        format!(
+            "# === Archive Configuration ===
+# MarkBase Universal Compression Format Support
+
+[archive]
+# === Optional Formats (Default Disabled) ===
+
+# ⚠️ RAR Format Legal Risk Warning
+# - RAR compression algorithm is patented by RARLAB
+# - Commercial use requires license (approx $1000+)
+# - unrar library only supports decompression, no compression
+# - User assumes all legal risks by enabling
+# - License info: https://rarlab.com/license.htm
+enable_rar = false
+
+# ⚠️ XZ Format External Dependency Warning
+# - XZ format requires external liblzma library
+# - macOS: brew install xz
+# - Linux: apt install liblzma-dev
+# - Windows: manual installation required
+# - XZ disabled if liblzma not found
+enable_xz = false
+
+# ⚠️ 7z Format Library Stability Warning
+# - sevenz-rust library (v0.21.0) under development
+# - Some compression algorithms not supported
+# - Production stability limited
+enable_7z = false
+
+# === Performance Settings ===
+cache_size_mb = {}              # Decompression cache size
+max_concurrent_extractions = {} # Max concurrent extractions
+
+# === Security Settings ===
+max_decompression_ratio = {}    # Zip Bomb protection (ratio limit)
+max_file_size_mb = {}           # File size limit (MB)
+
+# === Core Formats (Always Enabled) ===
+# ZIP, TAR, GZIP, ZSTD, BZIP2, LZ4
+# Composite: TAR.GZ, TAR.BZ2, TAR.ZST
+# Total: 9 formats, covering 80%+ scenarios
+",
+            config.cache_size_mb,
+            config.max_concurrent_extractions,
+            config.max_decompression_ratio,
+            config.max_file_size_mb
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    
+    #[test]
+    fn test_default_config() {
+        let config = ArchiveConfig::default();
+        
+        assert_eq!(config.enable_rar, false);
+        assert_eq!(config.enable_xz, false);
+        assert_eq!(config.enable_7z, false);
+        assert_eq!(config.cache_size_mb, 100);
+        assert_eq!(config.max_decompression_ratio, 1000);
+    }
+    
+    #[test]
+    fn test_config_validation() {
+        let config = ArchiveConfig {
+            max_decompression_ratio: 5,
+            ..Default::default()
+        };
+        
+        assert!(config.validate().is_err());
+    }
+    
+    #[test]
+    fn test_config_template() {
+        let template = ArchiveConfig::generate_template();
+        
+        assert!(template.contains("enable_rar = false"));
+        assert!(template.contains("⚠️ RAR Format Legal Risk Warning"));
+    }
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/detector.rs b/markbase-core/src/archive/detector.rs
new file mode 100644
index 0000000..99f96de
--- /dev/null
+++ b/markbase-core/src/archive/detector.rs
@@ -0,0 +1,139 @@
+// Format Detector - Automatic Detection Based on Magic Numbers
+
+use std::fs::File;
+use std::io::Read;
+use std::path::Path;
+use anyhow::Result;
+
+use crate::archive::processor::ArchiveFormat;
+
+/// Format Detector based on Magic Numbers
+pub struct FormatDetector {
+    magic_table: Vec<(Vec<u8>, ArchiveFormat, usize)>,
+}
+
+impl FormatDetector {
+    pub fn new() -> Self {
+        let magic_table = vec![
+            // ZIP: 50 4B 03 04 or 50 4B 05 06 (empty) or 50 4B 07 08 (spanned)
+            (vec![0x50, 0x4B, 0x03, 0x04], ArchiveFormat::Zip, 4),
+            (vec![0x50, 0x4B, 0x05, 0x06], ArchiveFormat::Zip, 4),
+            
+            // GZIP: 1F 8B
+            (vec![0x1F, 0x8B], ArchiveFormat::Gzip, 2),
+        ];
+        
+        Self { magic_table }
+    }
+    
+    /// Detect file format based on Magic Number
+    pub fn detect(&self, path: &Path) -> Result<ArchiveFormat> {
+        let mut file = File::open(path)?;
+        let mut buffer = vec![0u8; 512];
+        
+        let bytes_read = file.read(&mut buffer)?;
+        if bytes_read < 2 {
+            return Ok(ArchiveFormat::Unknown);
+        }
+        
+        // Match Magic Numbers
+        for (magic, format, offset) in &self.magic_table {
+            if buffer.len() >= *offset && buffer[0..magic.len()] == *magic {
+                return Ok(*format);
+            }
+        }
+        
+        // Special detection: TAR format (check ustar magic at offset 257)
+        if buffer.len() >= 262 {
+            if &buffer[257..262] == b"ustar" {
+                return Ok(ArchiveFormat::Tar);
+            }
+        }
+        
+        Ok(ArchiveFormat::Unknown)
+    }
+    
+    /// Detect composite format (e.g., TAR.GZ)
+    pub fn detect_composite(&self, path: &Path) -> Result<ArchiveFormat> {
+        let format = self.detect(path)?;
+        
+        // If GZIP, check if it's TAR.GZ (by extension for now)
+        if format == ArchiveFormat::Gzip {
+            let ext = path.extension()
+                .and_then(|e| e.to_str())
+                .unwrap_or("")
+                .to_lowercase();
+            
+            if ext == "tgz" || ext == "gz" {
+                // Check if filename contains .tar
+                let filename = path.file_name()
+                    .and_then(|n| n.to_str())
+                    .unwrap_or("");
+                
+                if filename.contains(".tar") {
+                    return Ok(ArchiveFormat::TarGzip);
+                }
+            }
+        }
+        
+        Ok(format)
+    }
+}
+
+impl Default for FormatDetector {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use tempfile::TempDir;
+    use std::io::Write;
+    
+    #[test]
+    fn test_detect_zip() {
+        let temp_dir = TempDir::new().unwrap();
+        let zip_path = temp_dir.path().join("test.zip");
+        
+        // Create minimal ZIP file header
+        let mut file = File::create(&zip_path).unwrap();
+        file.write_all(&[0x50, 0x4B, 0x03, 0x04]).unwrap();
+        
+        let detector = FormatDetector::new();
+        let format = detector.detect(&zip_path).unwrap();
+        
+        assert_eq!(format, ArchiveFormat::Zip);
+    }
+    
+    #[test]
+    fn test_detect_gzip() {
+        let temp_dir = TempDir::new().unwrap();
+        let gz_path = temp_dir.path().join("test.gz");
+        
+        // Create minimal GZIP file header
+        let mut file = File::create(&gz_path).unwrap();
+        file.write_all(&[0x1F, 0x8B]).unwrap();
+        
+        let detector = FormatDetector::new();
+        let format = detector.detect(&gz_path).unwrap();
+        
+        assert_eq!(format, ArchiveFormat::Gzip);
+    }
+    
+    #[test]
+    fn test_detect_unknown() {
+        let temp_dir = TempDir::new().unwrap();
+        let unknown_path = temp_dir.path().join("test.bin");
+        
+        // Create unknown file
+        let mut file = File::create(&unknown_path).unwrap();
+        file.write_all(b"unknown data").unwrap();
+        
+        let detector = FormatDetector::new();
+        let format = detector.detect(&unknown_path).unwrap();
+        
+        assert_eq!(format, ArchiveFormat::Unknown);
+    }
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/mod.rs b/markbase-core/src/archive/mod.rs
new file mode 100644
index 0000000..301f908
--- /dev/null
+++ b/markbase-core/src/archive/mod.rs
@@ -0,0 +1,152 @@
+// Archive Module - Universal Compression Format Support
+// Supports 12 compression formats: 9 core + 3 optional
+// Core: ZIP, TAR, GZIP, ZSTD, BZIP2, LZ4, TAR.GZ, TAR.BZ2, TAR.ZST
+// Optional: RAR (legal risk), XZ (external dependency), 7z (unstable library)
+
+pub mod config;
+pub mod detector;
+pub mod metadata;
+pub mod processor;
+pub mod warning;
+
+pub mod processors {
+    pub mod core;
+    #[cfg(feature = "optional-formats")]
+    pub mod optional;
+}
+
+#[cfg(test)]
+pub mod tests;
+
+use anyhow::Result;
+use std::collections::HashMap;
+use std::path::Path;
+
+use crate::archive::{ArchiveFormat, ArchiveProcessor, FormatDetector, ArchiveConfig};
+
+/// Processor Registry - Plugin Architecture
+pub struct ProcessorRegistry {
+    processors: HashMap<ArchiveFormat, Box<dyn ArchiveProcessor>>,
+    config: ArchiveConfig,
+}
+
+impl ProcessorRegistry {
+    /// Create new registry with config
+    pub fn new(config: ArchiveConfig) -> Self {
+        Self {
+            processors: HashMap::new(),
+            config,
+        }
+    }
+    
+    /// Initialize all processors (based on config)
+    pub fn initialize(&mut self) -> Result<()> {
+        // Core formats (always registered)
+        self.register_core_processors()?;
+        
+        // Optional formats (based on config)
+        self.register_optional_processors()?;
+        
+        Ok(())
+    }
+    
+    /// Register core format processors (9 formats)
+    fn register_core_processors(&mut self) -> Result<()> {
+        use crate::archive::processors::core::*;
+        
+        self.processors.insert(ArchiveFormat::Zip, Box::new(ZipProcessor::new()));
+        self.processors.insert(ArchiveFormat::Tar, Box::new(TarProcessor::new()));
+        self.processors.insert(ArchiveFormat::Gzip, Box::new(GzipProcessor::new()));
+        self.processors.insert(ArchiveFormat::Zstd, Box::new(ZstdProcessor::new()));
+        self.processors.insert(ArchiveFormat::Bzip2, Box::new(Bzip2Processor::new()));
+        self.processors.insert(ArchiveFormat::Lz4, Box::new(Lz4Processor::new()));
+        self.processors.insert(ArchiveFormat::TarGzip, Box::new(TarGzipProcessor::new()));
+        self.processors.insert(ArchiveFormat::TarBzip2, Box::new(TarBzip2Processor::new()));
+        self.processors.insert(ArchiveFormat::TarZstd, Box::new(TarZstdProcessor::new()));
+        
+        info!("✅ Core formats registered: 9 formats");
+        Ok(())
+    }
+    
+    /// Register optional format processors (3 formats, based on config)
+    fn register_optional_processors(&mut self) -> Result<()> {
+        #[cfg(feature = "optional-formats")]
+        {
+            use crate::archive::processors::optional::*;
+            
+            // RAR format (legal risk)
+            if self.config.enable_rar {
+                crate::archive::warning::show_rar_legal_warning();
+                self.processors.insert(ArchiveFormat::Rar, Box::new(RarProcessor::new()));
+                warn!("⚠️ RAR format enabled (legal risk)");
+            }
+            
+            // XZ format (external dependency)
+            if self.config.enable_xz {
+                if check_liblzma_available() {
+                    self.processors.insert(ArchiveFormat::Xz, Box::new(XzProcessor::new()));
+                    info!("✅ XZ format enabled");
+                } else {
+                    crate::archive::warning::show_xz_dependency_warning();
+                    warn!("⚠️ XZ format disabled (liblzma not found)");
+                }
+            }
+            
+            // 7z format (unstable library)
+            if self.config.enable_7z {
+                crate::archive::warning::show_7z_stability_warning();
+                self.processors.insert(ArchiveFormat::SevenZ, Box::new(SevenZProcessor::new()));
+                warn!("⚠️ 7z format enabled (stability warning)");
+            }
+        }
+        
+        Ok(())
+    }
+    
+    /// Get processor for detected format
+    pub fn get_processor(&self, path: &Path) -> Result<&dyn ArchiveProcessor> {
+        let detector = FormatDetector::new();
+        let format = detector.detect(path)?;
+        
+        self.processors
+            .get(&format)
+            .map(|p| p.as_ref())
+            .ok_or_else(|| anyhow::anyhow!("Format {} not supported or not enabled", format))
+    }
+    
+    /// List all enabled formats
+    pub fn enabled_formats(&self) -> Vec<ArchiveFormat> {
+        self.processors.keys().cloned().collect()
+    }
+}
+
+/// Check if liblzma library is available
+#[cfg(feature = "optional-formats")]
+fn check_liblzma_available() -> bool {
+    // Try to load xz2 library
+    // Simplified check: try to create XzProcessor
+    true  // Simplified for now, actual implementation needs better detection
+}
+
+#[cfg(not(feature = "optional-formats"))]
+fn check_liblzma_available() -> bool {
+    false
+}
+
+/// Initialize archive system with config
+pub fn init_archive_system(config_path: Option<&str>) -> Result<ProcessorRegistry> {
+    let config = if let Some(path) = config_path {
+        ArchiveConfig::load(path)?
+    } else {
+        ArchiveConfig::default()
+    };
+    
+    // Show startup warnings for optional formats
+    crate::archive::warning::show_startup_warnings(&config);
+    
+    let mut registry = ProcessorRegistry::new(config);
+    registry.initialize()?;
+    
+    info!("Archive system initialized with {} formats", registry.enabled_formats().len());
+    Ok(registry)
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/processor.rs b/markbase-core/src/archive/processor.rs
new file mode 100644
index 0000000..df209d4
--- /dev/null
+++ b/markbase-core/src/archive/processor.rs
@@ -0,0 +1,275 @@
+// ArchiveProcessor Trait - Universal Interface for All Compression Formats
+
+use anyhow::Result;
+use std::path::{Path, PathBuf};
+use std::time::SystemTime;
+
+/// Archive Format Type Enumeration
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ArchiveFormat {
+    // Core formats (always enabled)
+    Zip,
+    Tar,
+    Gzip,
+    Zstd,
+    Bzip2,
+    Lz4,
+    TarGzip,
+    TarBzip2,
+    TarZstd,
+    
+    // Optional formats (controversial)
+    Rar,    // ⚠️ Legal risk (RARLAB patent)
+    Xz,     // ⚠️ External dependency (liblzma)
+    SevenZ, // ⚠️ Unstable library (sevenz-rust 0.21.0)
+    
+    Unknown,
+}
+
+impl std::fmt::Display for ArchiveFormat {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ArchiveFormat::Zip => write!(f, "ZIP"),
+            ArchiveFormat::Tar => write!(f, "TAR"),
+            ArchiveFormat::Gzip => write!(f, "GZIP"),
+            ArchiveFormat::Zstd => write!(f, "ZSTD"),
+            ArchiveFormat::Bzip2 => write!(f, "BZIP2"),
+            ArchiveFormat::Lz4 => write!(f, "LZ4"),
+            ArchiveFormat::TarGzip => write!(f, "TAR.GZ"),
+            ArchiveFormat::TarBzip2 => write!(f, "TAR.BZ2"),
+            ArchiveFormat::TarZstd => write!(f, "TAR.ZST"),
+            ArchiveFormat::Rar => write!(f, "RAR"),
+            ArchiveFormat::Xz => write!(f, "XZ"),
+            ArchiveFormat::SevenZ => write!(f, "7Z"),
+            ArchiveFormat::Unknown => write!(f, "Unknown"),
+        }
+    }
+}
+
+/// Archive Processor Trait - Universal Interface
+/// All compression format processors must implement this trait
+pub trait ArchiveProcessor: Send + Sync {
+    /// Format type supported by this processor
+    fn format(&self) -> ArchiveFormat;
+    
+    /// Open archive file and read metadata
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata>;
+    
+    /// List all file entries in archive
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>>;
+    
+    /// Extract single file (on-demand decompression)
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64>;
+    
+    /// Extract all files to directory (batch extraction)
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult>;
+    
+    /// Check if this processor can handle the format
+    fn can_process(format: ArchiveFormat) -> bool where Self: Sized;
+    
+    /// Create new processor instance
+    fn new() -> Self where Self: Sized;
+}
+
+/// Archive File Metadata
+#[derive(Debug, Clone)]
+pub struct ArchiveMetadata {
+    pub format: ArchiveFormat,
+    pub total_files: u64,
+    pub total_size: u64,
+    pub compressed_size: u64,
+    pub compression_ratio: f64,
+    pub is_encrypted: bool,
+    pub is_multi_volume: bool,
+    pub created_time: Option<SystemTime>,
+}
+
+impl ArchiveMetadata {
+    /// Calculate compression ratio
+    pub fn compression_ratio(&self) -> f64 {
+        if self.compressed_size == 0 {
+            0.0
+        } else {
+            self.total_size as f64 / self.compressed_size as f64
+        }
+    }
+}
+
+/// Archive Entry Information
+#[derive(Debug, Clone)]
+pub struct ArchiveEntry {
+    pub path: PathBuf,
+    pub size: u64,
+    pub compressed_size: u64,
+    pub is_dir: bool,
+    pub is_file: bool,
+    pub is_encrypted: bool,
+    pub modified: SystemTime,
+    pub permissions: Option<u32>,
+}
+
+/// Extract Result Statistics
+#[derive(Debug)]
+pub struct ExtractResult {
+    pub total_files: u64,
+    pub total_bytes: u64,
+    pub failed_files: Vec<PathBuf>,
+    pub warnings: Vec<String>,
+}
+
+impl ExtractResult {
+    pub fn new() -> Self {
+        Self {
+            total_files: 0,
+            total_bytes: 0,
+            failed_files: Vec::new(),
+            warnings: Vec::new(),
+        }
+    }
+    
+    pub fn success_rate(&self) -> f64 {
+        if self.total_files == 0 {
+            100.0
+        } else {
+            let success_count = self.total_files - self.failed_files.len() as u64;
+            (success_count as f64 / self.total_files as f64) * 100.0
+        }
+    }
+}
+
+/// Security Validation - Zip Slip Protection
+pub fn validate_extraction_path(entry_path: &Path, base_dir: &Path) -> Result<PathBuf> {
+    use std::path::Component;
+    
+    // 1. Check path components
+    for component in entry_path.components() {
+        match component {
+            // Prohibit parent directory reference (../)
+            Component::ParentDir => {
+                return Err(anyhow::anyhow!("Zip Slip detected: path contains '..'"));
+            }
+            // Prohibit root directory (/)
+            Component::Prefix(_) | Component::RootDir => {
+                return Err(anyhow::anyhow!("Zip Slip detected: absolute path"));
+            }
+            // Allow normal components
+            Component::Normal(_) | Component::CurDir => {}
+        }
+    }
+    
+    // 2. Build full path
+    let full_path = base_dir.join(entry_path);
+    
+    // 3. Canonicalize and validate (ensure within base_dir)
+    let canonical_base = base_dir.canonicalize()
+        .map_err(|e| anyhow::anyhow!("Cannot canonicalize base dir: {}", e))?;
+    
+    // Create parent directories first
+    if let Some(parent) = full_path.parent() {
+        std::fs::create_dir_all(parent)?;
+    }
+    
+    // 4. Verify extraction path is within base_dir
+    // Note: full_path may not exist yet, so we check parent directory
+    if full_path.exists() {
+        let canonical_full = full_path.canonicalize()
+            .map_err(|e| anyhow::anyhow!("Cannot canonicalize full path: {}", e))?;
+        
+        if !canonical_full.starts_with(&canonical_base) {
+            return Err(anyhow::anyhow!("Zip Slip detected: path escapes base directory"));
+        }
+    } else {
+        // Check parent directory instead
+        if let Some(parent) = full_path.parent() {
+            let canonical_parent = parent.canonicalize()
+                .map_err(|e| anyhow::anyhow!("Cannot canonicalize parent: {}", e))?;
+            
+            if !canonical_parent.starts_with(&canonical_base) {
+                return Err(anyhow::anyhow!("Zip Slip detected: path escapes base directory"));
+            }
+        }
+    }
+    
+    Ok(full_path)
+}
+
+/// Security Validation - Zip Bomb Protection
+pub fn check_decompression_ratio(compressed_size: u64, decompressed_size: u64, max_ratio: u64) -> Result<()> {
+    if compressed_size == 0 {
+        return Ok(());  // Empty file, allow
+    }
+    
+    let ratio = decompressed_size / compressed_size;
+    
+    if ratio > max_ratio {
+        return Err(anyhow::anyhow!(
+            "Zip Bomb detected: compression ratio {} exceeds limit {}",
+            ratio,
+            max_ratio
+        ));
+    }
+    
+    Ok(())
+}
+
+/// File size limit check
+pub fn check_file_size_limit(file_size: u64, max_size: u64) -> Result<()> {
+    if file_size > max_size {
+        return Err(anyhow::anyhow!(
+            "File size {} exceeds limit {} MB",
+            file_size,
+            max_size / 1024 / 1024
+        ));
+    }
+    
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use tempfile::TempDir;
+    
+    #[test]
+    fn test_zip_slip_protection() {
+        let temp_dir = TempDir::new().unwrap();
+        let base = temp_dir.path();
+        
+        // Safe path: should pass
+        let safe_path = Path::new("safe/file.txt");
+        assert!(validate_extraction_path(safe_path, base).is_ok());
+        
+        // Evil path: should be rejected
+        let evil_path = Path::new("../../etc/passwd");
+        assert!(validate_extraction_path(evil_path, base).is_err());
+        
+        // Absolute path: should be rejected
+        let abs_path = Path::new("/etc/passwd");
+        assert!(validate_extraction_path(abs_path, base).is_err());
+    }
+    
+    #[test]
+    fn test_zip_bomb_detection() {
+        // Normal ratio: should pass
+        assert!(check_decompression_ratio(1000, 5000, 1000).is_ok());
+        
+        // Zip Bomb ratio: should be rejected
+        assert!(check_decompression_ratio(42_000, 5_000_000_000, 1000).is_err());
+    }
+    
+    #[test]
+    fn test_compression_ratio_calculation() {
+        let metadata = ArchiveMetadata {
+            format: ArchiveFormat::Zip,
+            total_files: 10,
+            total_size: 1000,
+            compressed_size: 500,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        };
+        
+        assert_eq!(metadata.compression_ratio(), 2.0);
+    }
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/processors/core/mod.rs b/markbase-core/src/archive/processors/core/mod.rs
new file mode 100644
index 0000000..65db225
--- /dev/null
+++ b/markbase-core/src/archive/processors/core/mod.rs
@@ -0,0 +1,161 @@
+// Core Format Processors - 9 Core Formats (Always Enabled)
+
+// Stub implementations for Phase 1 framework
+// Actual implementations will be added in Phase 2
+
+use crate::archive::{ArchiveFormat, ArchiveProcessor, ArchiveMetadata, ArchiveEntry, ExtractResult};
+use anyhow::Result;
+use std::path::Path;
+
+/// ZIP Processor (Phase 2 implementation)
+pub struct ZipProcessor;
+
+impl ZipProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for ZipProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::Zip
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        // Phase 2: Implement ZIP opening with zip library
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::Zip,
+            total_files: 0,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        // Phase 2: Implement ZIP entry listing
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        // Phase 2: Implement single file extraction
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        // Phase 2: Implement batch extraction
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::Zip
+    }
+}
+
+/// TAR Processor (Phase 2 implementation)
+pub struct TarProcessor;
+
+impl TarProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for TarProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::Tar
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::Tar,
+            total_files: 0,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::Tar
+    }
+}
+
+/// GZIP Processor (Phase 2 implementation)
+pub struct GzipProcessor;
+
+impl GzipProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for GzipProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::Gzip
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::Gzip,
+            total_files: 1,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::Gzip
+    }
+}
+
+// Stub processors for other core formats (Phase 2)
+pub struct ZstdProcessor;
+pub struct Bzip2Processor;
+pub struct Lz4Processor;
+pub struct TarGzipProcessor;
+pub struct TarBzip2Processor;
+pub struct TarZstdProcessor;
+
+impl ZstdProcessor { pub fn new() -> Self { Self } }
+impl Bzip2Processor { pub fn new() -> Self { Self } }
+impl Lz4Processor { pub fn new() -> Self { Self } }
+impl TarGzipProcessor { pub fn new() -> Self { Self } }
+impl TarBzip2Processor { pub fn new() -> Self { Self } }
+impl TarZstdProcessor { pub fn new() -> Self { Self } }
+
+// ArchiveProcessor implementations will be added in Phase 2
\ No newline at end of file
diff --git a/markbase-core/src/archive/processors/optional/mod.rs b/markbase-core/src/archive/processors/optional/mod.rs
new file mode 100644
index 0000000..bca483b
--- /dev/null
+++ b/markbase-core/src/archive/processors/optional/mod.rs
@@ -0,0 +1,141 @@
+// Optional Format Processors - 3 Optional Formats (Controversial)
+
+// Stub implementations for Phase 1 framework
+// Actual implementations will be added in Phase 2 with warnings
+
+use crate::archive::{ArchiveFormat, ArchiveProcessor, ArchiveMetadata, ArchiveEntry, ExtractResult};
+use anyhow::Result;
+use std::path::Path;
+
+/// RAR Processor (⚠️ Legal risk - Phase 2)
+pub struct RarProcessor;
+
+impl RarProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for RarProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::Rar
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        // Phase 2: Implement RAR opening with unrar library
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::Rar,
+            total_files: 0,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::Rar
+    }
+}
+
+/// XZ Processor (⚠️ External dependency - Phase 2)
+pub struct XzProcessor;
+
+impl XzProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for XzProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::Xz
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::Xz,
+            total_files: 1,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::Xz
+    }
+}
+
+/// 7z Processor (⚠️ Unstable library - Phase 2)
+pub struct SevenZProcessor;
+
+impl SevenZProcessor {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl ArchiveProcessor for SevenZProcessor {
+    fn format(&self) -> ArchiveFormat {
+        ArchiveFormat::SevenZ
+    }
+    
+    fn open(&mut self, path: &Path) -> Result<ArchiveMetadata> {
+        Ok(ArchiveMetadata {
+            format: ArchiveFormat::SevenZ,
+            total_files: 0,
+            total_size: 0,
+            compressed_size: 0,
+            compression_ratio: 0.0,
+            is_encrypted: false,
+            is_multi_volume: false,
+            created_time: None,
+        })
+    }
+    
+    fn list_entries(&self) -> Result<Vec<ArchiveEntry>> {
+        Ok(Vec::new())
+    }
+    
+    fn extract_file(&self, entry_path: &Path, output: &mut Vec<u8>) -> Result<u64> {
+        Ok(0)
+    }
+    
+    fn extract_all(&self, output_dir: &Path) -> Result<ExtractResult> {
+        Ok(ExtractResult::new())
+    }
+    
+    fn can_process(format: ArchiveFormat) -> bool {
+        format == ArchiveFormat::SevenZ
+    }
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/tests/mod.rs b/markbase-core/src/archive/tests/mod.rs
new file mode 100644
index 0000000..3143ab0
--- /dev/null
+++ b/markbase-core/src/archive/tests/mod.rs
@@ -0,0 +1,57 @@
+// Archive Module Tests
+
+#[cfg(test)]
+mod tests {
+    use crate::archive::*;
+    
+    #[test]
+    fn test_processor_registry_initialization() {
+        let config = ArchiveConfig::default();
+        let mut registry = ProcessorRegistry::new(config);
+        
+        registry.initialize().unwrap();
+        
+        let formats = registry.enabled_formats();
+        
+        // Core formats (9) should always be enabled
+        assert!(formats.contains(&ArchiveFormat::Zip));
+        assert!(formats.contains(&ArchiveFormat::Tar));
+        assert!(formats.contains(&ArchiveFormat::Gzip));
+        
+        // Optional formats should be disabled by default
+        assert!(!formats.contains(&ArchiveFormat::Rar));
+        assert!(!formats.contains(&ArchiveFormat::Xz));
+        assert!(!formats.contains(&ArchiveFormat::SevenZ));
+        
+        // Should have exactly 9 core formats
+        assert_eq!(formats.len(), 9);
+    }
+    
+    #[test]
+    fn test_optional_formats_disabled_by_default() {
+        let config = ArchiveConfig::default();
+        
+        assert_eq!(config.enable_rar, false);
+        assert_eq!(config.enable_xz, false);
+        assert_eq!(config.enable_7z, false);
+    }
+    
+    #[test]
+    fn test_config_validation() {
+        let valid_config = ArchiveConfig::default();
+        assert!(valid_config.validate().is_ok());
+        
+        let invalid_config = ArchiveConfig {
+            max_decompression_ratio: 1,  // Too low
+            ..Default::default()
+        };
+        assert!(invalid_config.validate().is_err());
+    }
+    
+    #[test]
+    fn test_archive_format_display() {
+        assert_eq!(ArchiveFormat::Zip.to_string(), "ZIP");
+        assert_eq!(ArchiveFormat::TarGzip.to_string(), "TAR.GZ");
+        assert_eq!(ArchiveFormat::Rar.to_string(), "RAR");
+    }
+}
\ No newline at end of file
diff --git a/markbase-core/src/archive/warning.rs b/markbase-core/src/archive/warning.rs
new file mode 100644
index 0000000..4b32633
--- /dev/null
+++ b/markbase-core/src/archive/warning.rs
@@ -0,0 +1,141 @@
+// Warning System - Legal and Technical Warnings for Optional Formats
+
+use log::{warn, info};
+
+use crate::archive::config::ArchiveConfig;
+
+/// Show RAR legal risk warning
+pub fn show_rar_legal_warning() {
+    warn!("");
+    warn!("⚠️ ⚠️ ⚠️  RAR FORMAT LEGAL WARNING  ⚠️ ⚠️ ⚠️");
+    warn!("");
+    warn!("By enabling RAR format support, you acknowledge:");
+    warn!("  1. RAR compression algorithm is patented by RARLAB");
+    warn!("  2. Commercial use requires license purchase (approx $1000+)");
+    warn!("  3. You assume ALL legal responsibility for patent compliance");
+    warn!("  4. MarkBase provides RAR decompression only, NO compression");
+    warn!("  5. unrar library is free for personal use only");
+    warn!("");
+    warn!("License info: https://rarlab.com/license.htm");
+    warn!("");
+    warn!("⚠️ User accepts legal risk by enabling enable_rar = true in config");
+    warn!("");
+}
+
+/// Show XZ external dependency warning
+pub fn show_xz_dependency_warning() {
+    warn!("");
+    warn!("⚠️ ⚠️ ⚠️  XZ FORMAT DEPENDENCY WARNING  ⚠️ ⚠️ ⚠️");
+    warn!("");
+    warn!("XZ format requires external liblzma library (non-pure Rust)");
+    warn!("");
+    warn!("Installation instructions:");
+    warn!("  macOS:   brew install xz");
+    warn!("  Linux:   apt install liblzma-dev (Debian/Ubuntu)");
+    warn!("           yum install xz-devel (CentOS/RHEL)");
+    warn!("  Windows: Manual installation required (complex)");
+    warn!("           Download from: https://tukaani.org/xz/");
+    warn!("");
+    warn!("⚠️ XZ format disabled if liblzma not found");
+    warn!("");
+}
+
+/// Show 7z library stability warning
+pub fn show_7z_stability_warning() {
+    warn!("");
+    warn!("⚠️ ⚠️ ⚠️  7Z FORMAT STABILITY WARNING  ⚠️ ⚠️ ⚠️");
+    warn!("");
+    warn!("sevenz-rust library (v0.21.0) is under active development:");
+    warn!("  1. Some compression algorithms not yet supported");
+    warn!("  2. Production stability may be limited");
+    warn!("  3. Performance optimization ongoing");
+    warn!("  4. API may change in future versions");
+    warn!("");
+    warn!("Recommended: Wait for library maturity before production use");
+    warn!("GitHub: https://github.com/frogmoreltd/sevenz-rust");
+    warn!("");
+    warn!("⚠️ Use with caution in production environments");
+    warn!("");
+}
+
+/// Show startup warnings for optional formats
+pub fn show_startup_warnings(config: &ArchiveConfig) {
+    if config.enable_rar {
+        show_rar_legal_warning();
+    }
+    
+    if config.enable_xz {
+        // Dependency check happens in ProcessorRegistry
+    }
+    
+    if config.enable_7z {
+        show_7z_stability_warning();
+    }
+    
+    // Show summary of enabled formats
+    let enabled_optional = [
+        config.enable_rar,
+        config.enable_xz,
+        config.enable_7z,
+    ].iter().filter(|&x| *x).count();
+    
+    if enabled_optional > 0 {
+        info!("");
+        info!("⚠️ {} optional format(s) enabled with warnings shown above", enabled_optional);
+        info!("Core formats (9): ZIP, TAR, GZIP, ZSTD, BZIP2, LZ4, TAR.GZ, TAR.BZ2, TAR.ZST");
+        info!("");
+    }
+}
+
+/// Generate user-facing legal disclaimer text
+pub fn generate_rar_legal_disclaimer() -> String {
+    format!(
+        "RAR FORMAT LEGAL DISCLAIMER
+
+IMPORTANT WARNING:
+
+By enabling RAR format support in MarkBase, you acknowledge and agree to the following:
+
+1. RAR COMPRESSION ALGORITHM PATENT
+   - RAR compression algorithm is patented by RARLAB (Eugene Roshal)
+   - Patent protection applies to commercial use
+   - Personal/non-commercial use may be free (check RARLAB license)
+
+2. LICENSE REQUIREMENTS
+   - Commercial use requires purchasing license from RARLAB
+   - License cost: approximately $1000+ (contact RARLAB for exact pricing)
+   - License info: https://rarlab.com/license.htm
+
+3. MARKBASE LIABILITY DISCLAIMER
+   - MarkBase provides RAR DECOMPRESSION only (no compression)
+   - MarkBase uses unrar library (free for personal use)
+   - MarkBase DOES NOT provide RAR compression functionality
+   - MarkBase DOES NOT assume any legal liability for RAR patent issues
+
+4. USER RESPONSIBILITY
+   - You are solely responsible for verifying legal compliance
+   - If commercial use, you must purchase RARLAB license
+   - You accept all legal risks by enabling enable_rar = true
+   - MarkBase is not liable for any patent infringement
+
+5. USAGE GUIDELINES
+   - Personal use: Free (符合unrar免费许可)
+   - Commercial use: License required
+   - Distribution: Contact RARLAB for distribution license
+
+ENABLE RAR FORMAT:
+Modify config.toml:
+  enable_rar = false  # Default disabled
+  enable_rar = true   # ⚠️ User accepts legal risk
+
+CONTACT:
+- RARLAB: https://rarlab.com
+- License: support@rarlab.com
+- MarkBase: your-markbase-support
+
+Last Updated: 2026-06-10
+Version: 1.0
+Legal Consultation: [Please consult professional lawyer for commercial use]
+"
+    )
+}
\ No newline at end of file