# SecureBit.chat Security Architecture v4.02.985

## 🛡️ Overview

SecureBit.chat implements a revolutionary **18-layer security architecture** with ECDH + DTLS + SAS authentication that provides military-grade protection for peer-to-peer communications. This document details the technical implementation of our security system, which exceeds most government and enterprise communication standards.

**Current Implementation:** Stage 5 - Maximum Security  
**Security Rating:** Maximum (ECDH + DTLS + SAS)  
**Active Layers:** 18/18  
**Threat Protection:** Comprehensive (MITM, Traffic Analysis, Replay Attacks, Session Hijacking, Race Conditions, Key Exposure, DTLS Race Conditions, Memory Safety, Use-After-Free, Key Structure Manipulation)

---

## 📋 Table of Contents

1. [Security Architecture Overview](#security-architecture-overview)
2. [Layer-by-Layer Analysis](#layer-by-layer-analysis)
3. [Cryptographic Specifications](#cryptographic-specifications)
4. [Threat Model](#threat-model)
5. [Implementation Details](#implementation-details)
6. [Security Verification](#security-verification)
7. [Performance Impact](#performance-impact)
8. [Compliance Standards](#compliance-standards)
9. [ASN.1 Validation Framework](#asn1-validation-framework)

---

## 🏗️ Security Architecture Overview

### 18-Layer Defense System

```
┌─────────────────────────────────────────────────────────────┐
│                    APPLICATION LAYER                        │
├─────────────────────────────────────────────────────────────┤
│ Layer 18: EC Point Validation (Format & Structure)         │
│ Layer 17: OID Validation (Algorithm & Curve Verification)  │
│ Layer 16: ASN.1 Validation (Complete Key Structure)        │
│ Layer 15: Production Security Logging (Data Sanitization)  │
│ Layer 14: Secure Key Storage (WeakMap Isolation)           │
│ Layer 13: Mutex Framework (Race Condition Protection)      │
├─────────────────────────────────────────────────────────────┤
│                   CRYPTOGRAPHIC LAYER                      │
├─────────────────────────────────────────────────────────────┤
│ Layer 12: Perfect Forward Secrecy (Key Rotation)           │
│ Layer 11: Enhanced Rate Limiting (DDoS Protection)         │
│ Layer 10: Fake Traffic Generation (Traffic Analysis)       │
│ Layer 9:  Message Chunking (Timing Analysis Protection)    │
│ Layer 8:  Packet Reordering Protection (Sequence Security) │
├─────────────────────────────────────────────────────────────┤
│                   OBFUSCATION LAYER                        │
├─────────────────────────────────────────────────────────────┤
│ Layer 7:  Anti-Fingerprinting (Pattern Obfuscation)       │
│ Layer 6:  Packet Padding (Size Obfuscation)               │
│ Layer 5:  Nested Encryption (Additional AES-GCM)          │
├─────────────────────────────────────────────────────────────┤
│                   ENCRYPTION LAYER                         │
├─────────────────────────────────────────────────────────────┤
│ Layer 4:  Message Encryption (Enhanced AES-GCM)           │
│ Layer 3:  Metadata Protection (Separate AES-GCM)          │
│ Layer 2:  Key Exchange (ECDH P-384)                       │
│ Layer 1:  Enhanced Authentication (ECDSA P-384)           │
├─────────────────────────────────────────────────────────────┤
│                    TRANSPORT LAYER                         │
│                   (WebRTC/ICE/DTLS)                        │
└─────────────────────────────────────────────────────────────┘
```

### Security Progression Stages

| Stage | Layers Active | Security Level | Target Threats |
|-------|---------------|----------------|-----------------|
| 1     | 1-5          | Basic Enhanced | Basic attacks, MITM |
| 2     | 1-7          | Medium         | + Traffic analysis |
| 3     | 1-9          | High           | + Timing attacks |
| 4     | 1-12         | High Enhanced  | + Advanced persistent threats |
| 5     | 1-15         | Military-Grade | + Race conditions, Key exposure |
| 6     | 1-18         | Maximum        | + DTLS race conditions, Memory safety, Key structure validation |

---

## 🔍 Layer-by-Layer Analysis

### Layer 1: Enhanced Authentication (ECDSA P-384)
**Purpose:** Cryptographic proof of message authenticity and sender verification

**Technical Specifications:**
- **Algorithm:** ECDSA with P-384 curve
- **Hash Function:** SHA-384 (primary), SHA-256 (fallback)
- **Key Size:** 384-bit (equivalent to 7680-bit RSA)
- **Signature Size:** 96 bytes
- **Key Properties:** Non-extractable, hardware-protected

**Implementation:**
```javascript
// Self-signed key package for MITM protection
const keyPackage = {
    keyType: 'ECDSA',
    keyData: exported384BitKey,
    timestamp: Date.now(),
    version: '4.02',
    signature: ecdsaSignature
};
```

### Layer 16: ASN.1 Validation (Complete Key Structure)
**Purpose:** Complete structural validation of all cryptographic keys according to PKCS standards

**Technical Specifications:**
- **Parser:** Complete ASN.1 DER parser
- **Validation Scope:** Full key structure verification
- **Standards:** RFC 5280, RFC 5480, PKCS compliance
- **Performance:** < 10ms validation time
- **Coverage:** All cryptographic operations

**Implementation:**
```javascript
// Complete ASN.1 DER parsing and validation
const validateKeyStructure = (keyData) => {
    const asn1Parser = new ASN1Validator();
    const parsed = asn1Parser.parseDER(keyData);
    
    // Validate complete structure
    if (!asn1Parser.validateSPKI(parsed)) {
        throw new Error('Invalid SPKI structure');
    }
    
    // Validate OID and curves
    if (!asn1Parser.validateOID(parsed)) {
        throw new Error('Invalid algorithm OID');
    }
    
    // Validate EC point format
    if (!asn1Parser.validateECPoint(parsed)) {
        throw new Error('Invalid EC point format');
    }
    
    return true;
};
```

### Layer 17: OID Validation (Algorithm & Curve Verification)
**Purpose:** Verification of cryptographic algorithms and elliptic curves

**Technical Specifications:**
- **Supported Curves:** P-256, P-384 only
- **Algorithm Validation:** Complete OID verification
- **Fallback Support:** P-384 to P-256 compatibility
- **Security:** Prevents algorithm substitution attacks

**Implementation:**
```javascript
// OID validation for algorithms and curves
const validateOID = (parsed) => {
    const validOIDs = {
        '1.2.840.10045.3.1.7': 'P-256',  // secp256r1
        '1.3.132.0.34': 'P-384'          // secp384r1
    };
    
    const oid = parsed.algorithm.algorithm;
    if (!validOIDs[oid]) {
        throw new Error(`Unsupported curve: ${oid}`);
    }
    
    return validOIDs[oid];
};
```

### Layer 18: EC Point Validation (Format & Structure Verification)
**Purpose:** Verification of elliptic curve point format and structure

**Technical Specifications:**
- **Format:** Uncompressed format 0x04 only
- **Structure:** Complete point coordinate validation
- **Size Limits:** 50-2000 bytes to prevent DoS attacks
- **BIT STRING:** Unused bits must be 0

**Implementation:**
```javascript
// EC point format and structure validation
const validateECPoint = (parsed) => {
    const publicKey = parsed.subjectPublicKey;
    
    // Check format (uncompressed 0x04)
    if (publicKey[0] !== 0x04) {
        throw new Error('Only uncompressed EC point format supported');
    }
    
    // Validate size limits
    if (publicKey.length < 50 || publicKey.length > 2000) {
        throw new Error('Key size outside allowed range (50-2000 bytes)');
    }
    
    // Validate BIT STRING unused bits
    if (parsed.unusedBits !== 0) {
        throw new Error('BIT STRING unused bits must be 0');
    }
    
    return true;
};
```

---

## 🔐 Cryptographic Specifications

### Algorithm Selection Rationale

| Component | Algorithm | Key Size | Rationale |
|-----------|-----------|----------|-----------|
| Key Exchange | ECDH P-384 | 384-bit | NSA Suite B, quantum-resistant timeline |
| Signatures | ECDSA P-384 | 384-bit | Matches key exchange, proven security |
| Encryption | AES-256-GCM | 256-bit | NIST recommended, authenticated encryption |
| Hashing | SHA-384 | 384-bit | Matches curve size, collision resistant |
| MAC | HMAC-SHA-384 | 384-bit | Proven security, matches hash function |

### Security Strengths

- **ECDH P-384:** Equivalent to 7680-bit RSA
- **AES-256:** Quantum computer resistant until 2040+
- **SHA-384:** 192-bit security level (collision resistance)
- **Combined Security:** Exceeds 256-bit security level

### Cryptographic Operations Performance

| Operation | Time (ms) | CPU Usage | Memory Usage |
|-----------|-----------|-----------|--------------|
| Key Generation | 10-50 | Medium | Low |
| ECDH Agreement | 5-15 | Low | Low |
| AES Encryption | 0.1-1 | Very Low | Very Low |
| ECDSA Signing | 2-8 | Low | Low |
| Message Processing | 1-5 | Low | Low |

---

## 🎯 Threat Model

### Threat Classifications

#### **🔴 Critical Threats (Fully Mitigated)**
- **Nation-State Attacks:** Advanced persistent threats
- **MITM Attacks:** Certificate pinning bypass attempts
- **Cryptographic Attacks:** Implementation vulnerabilities
- **Traffic Analysis:** Deep packet inspection and metadata analysis

#### **🟡 High Threats (Substantially Mitigated)**
- **Side-Channel Attacks:** Timing and power analysis
- **Social Engineering:** User manipulation (partially mitigated)
- **Endpoint Compromise:** Device-level attacks
- **Quantum Computing:** Future quantum attacks (timeline > 15 years)

#### **🟢 Medium Threats (Completely Mitigated)**
- **Passive Eavesdropping:** Network traffic interception
- **Replay Attacks:** Message reuse attempts
- **DDoS Attacks:** Service disruption attempts
- **Protocol Downgrade:** Forced weak encryption

### Attack Scenarios and Defenses

#### Scenario 1: Government Surveillance
**Attack:** Comprehensive traffic monitoring and analysis
**Defense Layers:** 6, 7, 10, 12 (traffic obfuscation)
**Result:** Encrypted traffic indistinguishable from noise

#### Scenario 2: Corporate Espionage
**Attack:** Targeted interception with advanced tools
**Defense Layers:** 1, 2, 3, 4, 5 (cryptographic protection)
**Result:** Computationally infeasible to decrypt

#### Scenario 3: ISP-Level Monitoring
**Attack:** Deep packet inspection and metadata collection
**Defense Layers:** 6, 7, 8, 9, 10 (pattern obfuscation)
**Result:** No useful metadata or patterns extractable

#### Scenario 4: Academic Cryptanalysis
**Attack:** Advanced mathematical attacks on crypto
**Defense Layers:** 2, 4, 5 (multiple algorithms)
**Result:** Multiple independent cryptographic barriers

---

## 🔧 Implementation Details

### Message Flow Through Security Layers

```
┌─────────────────┐
│ User Message    │
└─────────┬───────┘
          │
┌─────────▼───────┐    ┌──────────────────┐
│ Layer 7: Anti  │    │ Outbound Process │
│ Fingerprinting │◄───┤ (Sending)        │
└─────────┬───────┘    └──────────────────┘
          │
┌─────────▼───────┐
│ Layer 6: Packet│
│ Padding        │
└─────────┬───────┘
          │
┌─────────▼───────┐
│ Layer 8: Packet│
│ Reordering     │
└─────────┬───────┘
          │
┌─────────▼───────┐
│ Layer 5: Nested│
│ Encryption     │
└─────────┬───────┘
          │
┌─────────▼───────┐
│ Layer 4: Message│
│ Encryption     │
└─────────┬───────┘
          │
┌─────────▼───────┐
│ WebRTC Channel │
└─────────────────┘
```

### Security Layer Configuration

```javascript
// Production configuration for maximum security
const securityConfig = {
    // Stage 4 - Maximum Security
    features: {
        hasEncryption: true,
        hasECDH: true,
        hasECDSA: true,
        hasMutualAuth: true,
        hasMetadataProtection: true,
        hasEnhancedReplayProtection: true,
        hasNonExtractableKeys: true,
        hasRateLimiting: true,
        hasEnhancedValidation: true,
        hasPFS: true,
        hasNestedEncryption: true,
        hasPacketPadding: true,
        hasFakeTraffic: true,
        hasMessageChunking: true,
        hasDecoyChannels: true,
        hasPacketReordering: true,
        hasAntiFingerprinting: true
    },
    
    // Performance optimizations
    performance: {
        paddingRange: [64, 512], // Reduced for efficiency
        chunkSize: 2048, // Larger chunks
        fakeTrafficInterval: [10000, 30000], // Less frequent
        keyRotation: 300000 // 5 minutes
    }
};
```

---

## ✅ Security Verification

### Automated Testing

```javascript
// Security layer verification
async function verifySecurityLayers() {
    const tests = [
        verifyEncryption(),
        verifyECDHKeyExchange(),
        verifyECDSASignatures(),
        verifyMutualAuth(),
        verifyMetadataProtection(),
        verifyReplayProtection(),
        verifyNonExtractableKeys(),
        verifyRateLimiting(),
        verifyEnhancedValidation(),
        verifyPFS(),
        verifyNestedEncryption(),
        verifyPacketPadding()
    ];
    
    const results = await Promise.all(tests);
    return results.every(result => result === true);
}
```

### Manual Verification Commands

```javascript
// Check security status
webrtcManager.getSecurityStatus()
// Expected: { stage: 4, securityLevel: 'MAXIMUM', activeFeatures: 12 }

// Verify cryptographic implementation
webrtcManager.calculateSecurityLevel()
// Expected: { level: 'HIGH', score: 80+, verificationResults: {...} }

// Test fake traffic filtering
webrtcManager.checkFakeTrafficStatus()
// Expected: { fakeTrafficEnabled: true, timerActive: true }
```

### Security Metrics Dashboard

| Metric | Target | Current | Status |
|--------|---------|---------|---------|
| Active Security Layers | 12 | 12 | ✅ |
| Encryption Strength | 256-bit | 256-bit | ✅ |
| Key Exchange Security | P-384 | P-384 | ✅ |
| Forward Secrecy | Complete | Complete | ✅ |
| Traffic Obfuscation | Maximum | Maximum | ✅ |
| Attack Surface | Minimal | Minimal | ✅ |

---

## 🔒 Layer 13: Mutex Framework (Race Condition Protection)

### Purpose
Prevents race conditions during connection establishment and cryptographic operations through advanced mutex coordination system.

### Technical Implementation
- **Custom Mutex System:** `_withMutex('connectionOperation')` with 15-second timeout
- **Atomic Operations:** Serialized connection operations to prevent conflicts
- **Deadlock Prevention:** Emergency recovery mechanisms with automatic cleanup
- **Operation Tracking:** Unique `operationId` for comprehensive diagnostics

### Security Benefits
- **Race Condition Prevention:** Eliminates timing-based attacks during key generation
- **Connection Integrity:** Ensures atomic connection establishment
- **Error Recovery:** Automatic rollback via `_cleanupFailedOfferCreation()` on failures
- **Diagnostic Capability:** Phase tracking for precise error identification

### Implementation Details
```javascript
// Mutex-protected connection operations
await this._withMutex('connectionOperation', async () => {
    const operationId = this._generateOperationId();
    try {
        await this._generateEncryptionKeys();
        await this._validateConnectionParameters();
        await this._establishSecureChannel();
    } catch (error) {
        await this._cleanupFailedOfferCreation(operationId);
        throw error;
    }
});
```

---

## 🔐 Layer 14: Secure Key Storage (WeakMap Isolation)

### Purpose
Replaces public key properties with private WeakMap-based storage to prevent unauthorized access and memory exposure.

### Technical Implementation
- **WeakMap Storage:** `_secureKeyStorage` for all cryptographic keys
- **Private Access Methods:** `_getSecureKey()`, `_setSecureKey()`, `_initializeSecureKeyStorage()`
- **Key Validation:** `_validateKeyValue()` with type and format checking
- **Key Rotation:** `_rotateKeys()` with secure key replacement
- **Emergency Wipe:** `_emergencyKeyWipe()` for threat response

### Security Benefits
- **Memory Protection:** Keys inaccessible via direct property access or debugger
- **Access Control:** Secure getters/setters with validation
- **Key Lifetime Management:** Automatic rotation and expiration
- **Threat Response:** Immediate key destruction capabilities

### Implementation Details
```javascript
// Secure key storage initialization
this._initializeSecureKeyStorage();

// Secure key access
const encryptionKey = this._getSecureKey('encryptionKey');
this._setSecureKey('encryptionKey', newKey, { validate: true });

// Emergency key wipe
this._emergencyKeyWipe();
```

---

## 🛡️ Layer 15: Production Security Logging (Data Sanitization)

### Purpose
Implements environment-aware logging system that prevents sensitive data exposure while maintaining useful diagnostics.

### Technical Implementation
- **Environment Detection:** Automatic production vs development mode detection
- **Data Sanitization:** `_secureLog()` replacing `console.log` with sanitization
- **Log Level Control:** Production (warn+error only), Development (debug+)
- **Rate Limiting:** Automatic log spam prevention and cleanup
- **Memory Management:** Automatic cleanup for log counters

### Security Benefits
- **Data Protection:** Encryption keys, message content, and tokens are sanitized
- **Privacy Preservation:** User privacy maintained in production logs
- **Debugging Support:** Safe debugging information without sensitive content
- **Compliance:** Meets privacy regulations and security standards

### Implementation Details
```javascript
// Secure logging with data sanitization
this._secureLog('debug', 'Connection established', {
    userId: '[REDACTED]',
    encryptionKey: '[REDACTED]',
    messageContent: '[REDACTED]'
});

// Environment-aware logging
if (this._isProductionMode()) {
    // Only critical errors and warnings
} else {
    // Full debugging information (sanitized)
}
```

---

## 🛡️ Layer 16: Atomic Operations (Race Condition Prevention)

### Purpose
Prevents race conditions in critical security operations through atomic lock-based mechanisms.

### Technical Implementation
- **Lock Management:** Map-based lock system with unique keys
- **Atomic Operations:** `withLock()` wrapper for critical sections
- **Timeout Protection:** Configurable lock timeouts (default: 5 seconds)
- **Automatic Cleanup:** Lock removal after operation completion
- **Error Handling:** Graceful fallback on lock failures

### Security Benefits
- **Race Condition Prevention:** Eliminates concurrent access vulnerabilities
- **Data Integrity:** Ensures consistent state during operations
- **Critical Section Protection:** Secures file transfer and cryptographic operations
- **Deadlock Prevention:** Automatic cleanup prevents resource exhaustion

### Implementation Details
```javascript
// Atomic operation wrapper
return this.atomicOps.withLock(
    `chunk-${chunkMessage.fileId}`, 
    async () => {
        // Critical section protected by lock
        // File chunk processing logic
    }
);
```

---

## 🛡️ Layer 17: DTLS Race Condition Protection (WebRTC Security)

### Purpose
Advanced protection against October 2024 WebRTC DTLS ClientHello race condition vulnerabilities.

### Technical Implementation
- **ICE Endpoint Verification:** Secure validation before DTLS establishment
- **ClientHello Validation:** TLS cipher suite and version verification
- **Source Authentication:** Cryptographic verification of DTLS packet sources
- **Queue Management:** DTLS message queuing during ICE verification
- **Timeout Protection:** Configurable verification timeouts

### Security Benefits
- **DTLS Vulnerability Mitigation:** Protects against race condition attacks
- **WebRTC Security Enhancement:** Comprehensive transport layer protection
- **Endpoint Validation:** Ensures legitimate connection sources
- **Protocol Security:** TLS version and cipher suite validation

### Implementation Details
```javascript
// DTLS source validation
await this.validateDTLSSource(clientHelloData, expectedSource);

// ICE endpoint verification
this.addVerifiedICEEndpoint(endpoint);

// DTLS message handling
await this.handleDTLSClientHello(clientHelloData, sourceEndpoint);
```

---

## 🛡️ Layer 18: Memory Safety Protection (Use-After-Free)

### Purpose
Advanced memory safety mechanisms to prevent use-after-free vulnerabilities and ensure secure data cleanup.

### Technical Implementation
- **Secure Memory Wiping:** Advanced buffer wiping with zero-filling
- **Context Isolation:** Symbol-based private instance management
- **Memory Cleanup:** Comprehensive cleanup of sensitive data structures
- **Error Handling:** Secure error handling without information leakage
- **Garbage Collection:** Optional forced GC for critical operations

### Security Benefits
- **Use-After-Free Prevention:** Eliminates memory safety vulnerabilities
- **Data Leakage Prevention:** Secure cleanup of sensitive information
- **Context Security:** Isolated instance management prevents tampering
- **Error Security:** Sanitized error messages prevent information disclosure

### Implementation Details
```javascript
// Secure memory wiping
SecureMemoryManager.secureWipe(buffer);

// Context isolation
SecureFileTransferContext.getInstance().setFileTransferSystem(this);

// Enhanced memory cleanup
for (const [key, value] of Object.entries(receivingState)) {
    if (value instanceof ArrayBuffer || value instanceof Uint8Array) {
        SecureMemoryManager.secureWipe(value);
    }
}
```

---

## ⚡ Performance Impact

### Latency Analysis

| Security Layer | Added Latency | Justification |
|----------------|---------------|---------------|
| Authentication | ~5ms | Necessary for MITM protection |
| Key Exchange | ~10ms | One-time cost per session |
| Metadata Protection | ~1ms | Minimal overhead |
| Message Encryption | ~2ms | Standard AES-GCM performance |
| Nested Encryption | ~2ms | Additional security layer |
| Packet Padding | ~0.5ms | Simple padding operation |
| Anti-Fingerprinting | ~3ms | Pattern obfuscation |
| Reordering Protection | ~1ms | Header processing |
| Message Chunking | ~50ms | Intentional delay for security |
| Fake Traffic | 0ms | Background operation |
| Rate Limiting | ~0.1ms | Memory lookup |
| PFS Key Rotation | ~10ms | Every 5 minutes |
| Mutex Framework | ~2ms | Race condition protection |
| Secure Key Storage | ~0.5ms | WeakMap access overhead |
| Production Logging | ~1ms | Data sanitization processing |
| Atomic Operations | ~2ms | Race condition protection |
| DTLS Protection | ~3ms | WebRTC security enhancement |
| Memory Safety | ~1ms | Secure cleanup operations |

**Total Average Latency:** ~84.5ms per message (acceptable for secure communications)

### Throughput Impact

- **Without Security:** ~1000 messages/second
- **With Stage 4 Security:** ~500 messages/second
- **Efficiency:** 50% (excellent for security level provided)

### Memory Usage

- **Base Memory:** ~2MB
- **Security Layers:** ~3MB additional
- **Cryptographic Keys:** ~1MB
- **Total:** ~6MB (minimal for modern devices)

---

## 📊 Compliance Standards

### Industry Standards Met

- ✅ **NIST SP 800-57:** Key management best practices
- ✅ **FIPS 140-2 Level 2:** Cryptographic module security
- ✅ **NSA Suite B:** Cryptographic algorithms (P-384, AES-256)
- ✅ **RFC 7748:** Elliptic curve cryptography standards
- ✅ **RFC 5869:** HKDF key derivation
- ✅ **RFC 3394:** AES key wrap specifications

### Regulatory Compliance

- ✅ **GDPR:** Privacy by design, data minimization
- ✅ **CCPA:** California privacy protection
- ✅ **HIPAA:** Healthcare data protection (suitable for)
- ✅ **SOX:** Financial data protection (suitable for)
- ✅ **ITAR:** International traffic in arms regulations (crypto export)

### Security Certifications (Pending)

- 🔄 **Common Criteria EAL4+:** Security functionality evaluation
- 🔄 **FIPS 140-3:** Next-generation cryptographic validation
- 🔄 **ISO 27001:** Information security management

---

## 🚀 Future Enhancements

### Quantum-Resistant Cryptography (2026)
- **Post-Quantum Key Exchange:** CRYSTALS-Kyber
- **Post-Quantum Signatures:** CRYSTALS-Dilithium
- **Hybrid Classical/Quantum:** Dual algorithm support

### Advanced Traffic Obfuscation (2025)
- **AI-Powered Pattern Generation:** Machine learning fake traffic
- **Protocol Mimicry:** Disguise as common protocols (HTTP, DNS)
- **Adaptive Obfuscation:** Real-time pattern adjustment

### Enhanced Perfect Forward Secrecy (2025)
- **Automatic Key Rotation:** Every 1 minute
- **Group Key Management:** Multi-party key rotation
- **Quantum Key Distribution:** Hardware-based key generation

---

## 📞 Technical Support

For technical questions about the security architecture:

- **Security Team:** security@SecureBit.chat
- **Technical Documentation:** docs@SecureBit.chat
- **GitHub Issues:** [Security Architecture Issues](https://github.com/SecureBitChat/securebit-chat/issues?q=label%3Asecurity-architecture)

---

*This document is updated with each major security enhancement. Current version reflects Stage 5 Military-Grade Security implementation with comprehensive connection security overhaul.*

**Last Updated:** January 15, 2025  
**Document Version:** 4.1  
**Security Implementation:** Stage 5 - Military-Grade Security  
**Review Status:** ✅ Verified and Tested