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🔐 Secure Vault - Security Analysis Q&A

Document Purpose: Comprehensive security analysis answering key questions about the vault-app2 encryption, backup, and protection systems.

Last Updated: January 26, 2026

Table of Contents

  1. Encryption Security
  2. End-to-End Encryption
  3. Credential Hacking/Leaking Risks
  4. Data Loss Scenarios
  5. Backup System Assessment
  6. Optimal Backup Strategy
  7. Multi-Device Usage
  8. Mobile Compatibility
  9. Google Sync with Encryption
  10. Multi-Device Same Vault
  11. Power Loss Scenarios
  12. Web UI Vulnerabilities
  13. Route Access Rules
  14. File Upload Validation
  15. XSS Protection
  16. Backdoor/Tampering Protection
  17. Offline Security
  18. Biggest Security Weakness

1. Encryption Security

Question: How secure is the encryption system used in this project?

Answer: Very Strong (Military-Grade)

Component Specification Security Level
Cipher AES-256-GCM ✅ NSA approved for TOP SECRET
Key Derivation (Primary) Argon2id ✅ Winner of Password Hashing Competition
Key Derivation (Fallback) PBKDF2-SHA256 (310,000+ iterations) ✅ NIST recommended
Salt 32 bytes (256 bits) random ✅ Unique per vault
Nonce/IV 12 bytes (96 bits) random ✅ Unique per encryption
Authentication GCM Auth Tag (16 bytes) ✅ Tamper detection

Technical Details

From container.js:

// AES-GCM parameters
const AES_ALGORITHM = "aes-256-gcm";
const PBKDF2_ITERATIONS = 310000;
const PBKDF2_KEYLEN = 32; // 256-bit key
const PBKDF2_DIGEST = "sha256";

Argon2id Parameters (when available):

  • Memory Cost: 64 MiB
  • Time Cost: 3 iterations
  • Parallelism: 4 threads
  • Hash Length: 32 bytes

Container File Format

┌────────────┬─────────┬─────┬──────┬───────┬────────────┬─────────┐
│ VLT1       │ Version │ KDF │ Salt │ Nonce │ Ciphertext │ AuthTag │
├────────────┼─────────┼─────┼──────┼───────┼────────────┼─────────┤
│ 4 bytes    │ 1 byte  │ 1 B │ 32 B │ 12 B  │ Variable   │ 16 B    │
└────────────┴─────────┴─────┴──────┴───────┴────────────┴─────────┘

Tip

Brute-Force Resistance: With Argon2id requiring 64 MiB memory per attempt, GPU-based attacks are severely limited. At 1,000 attempts/second (unrealistically fast), a 12-word passphrase would take longer than the age of the universe to crack.

2. End-to-End Encryption

Question: Is this encryption end-to-end?

Answer: Yes, with local-first architecture

flowchart LR
    subgraph "Your Device"
        A["Plaintext Credentials"] -->|Encrypt| B["vault.enc<br/>(Encrypted)"]
        B -->|Decrypt| A
    end

    subgraph "Storage (Optional)"
        C["Cloud/Backup<br/>Only sees encrypted data"]
    end

    B -.->|Copy/Sync| C

    style A fill:#4ade80
    style B fill:#f87171
    style C fill:#fbbf24
Loading
Aspect Status Details
Encryption Location ✅ Client/Local All encryption/decryption happens on your device
Server Involvement ✅ Same Device Express server runs on 127.0.0.1 (localhost only)
Network Exposure ✅ None No external network connections
Key Storage ✅ In-Memory Only Passphrase never persisted, session tokens memory-only
Plaintext on Disk ✅ Only When Unlocked vault.tmp.db exists only while vault is open

Important

True E2E Guarantee: Since both frontend and backend run locally on your machine (especially in Electron mode), there is no "man-in-the-middle" possible. The encryption key never leaves your device.

3. Credential Hacking/Leaking Risks

Question: Is it possible for my credentials to be hacked or leaked?

Answer: Low risk with proper practices, but not zero

Protected Against ✅

Attack Vector Protection Implementation
Database Dump AES-256-GCM encryption Data unreadable without passphrase
Network Eavesdropping Localhost-only binding 127.0.0.1 prevents LAN access
Brute Force Rate limiting + strong KDF 5 attempts/15 min, 310k+ iterations
Credential Tampering GCM authentication tags Detects any modification
Session Theft In-memory tokens only Never persisted to disk
Memory Leakage secure_delete pragma SQLite overwrites deleted data
Cross-Tab Interference Single-session ownership Only one tab can modify at a time

NOT Protected Against ❌

Attack Vector Why Not Protected Mitigation
Keyloggers App cannot detect OS-level surveillance Use trusted computer
Screen Recording App cannot prevent screen capture Work in private
Physical Theft (unlocked) Vault accessible while open Use auto-lock, lock manually
Malware with Root Access Full system compromise Use antivirus, keep OS updated
Social Engineering Human factors Never share passphrase
Supply Chain Attacks npm dependency vulnerabilities Regular updates, audit deps

Caution

Unlocked Vulnerability: While the vault is unlocked, vault.tmp.db contains your credentials in plaintext SQLite format. Always lock the vault when not in use.

4. Data Loss Scenarios

Question: What happens if I lose my data?

Answer: Depends on the scenario

Scenario Matrix

Scenario Recovery Action Required
Forgot passphrase ❌ Impossible DATA LOST PERMANENTLY (no recovery mechanism)
Forgot PIN ✅ Recoverable Use "reset pin ?" link → verify passphrase → set new PIN
Deleted vault.enc ✅ If backed up Restore from backup ZIP
Corrupted vault.enc ✅ If backed up GCM auth will fail, restore from backup
Lost device ✅ If backed up Transfer backup to new device
App crash while unlocked ✅ Automatic vault.enc unchanged, temp files cleaned on restart
Power loss while unlocked ⚠️ Partial See Power Loss Scenarios

Warning

CRITICAL: There is NO "forgot password" feature. Your passphrase IS the encryption key. If you forget it, your data is permanently unrecoverable. Write it down securely or use a password manager.

Recovery Flow Diagram

flowchart TD
    A["Lost Access"] --> B{"What was lost?"}
    B -->|Passphrase| C["❌ DATA PERMANENTLY LOST<br/>No recovery possible"]
    B -->|PIN| D["Reset PIN via passphrase<br/>➝ /reset-pin page"]
    B -->|vault.enc file| E{"Have backup?"}
    E -->|Yes| F["Import vault from backup<br/>➝ Unlock screen → Import"]
    E -->|No| C
    B -->|Device| G{"Have backup?"}
    G -->|Yes| H["Install app on new device<br/>→ Import backup"]
    G -->|No| C

    style C fill:#ef4444
    style D fill:#22c55e
    style F fill:#22c55e
    style H fill:#22c55e
Loading

5. Backup System Assessment

Question: Is the current backup system good enough?

Answer: Good, but requires manual action

Current Backup Features

Feature Status Location
Export Backup ✅ Implemented Settings → Backup Vault
ZIP with Timestamp ✅ Implemented vault-backup_yy-mm-dd-h-m-s.zip (UTC+7)
Import/Restore ✅ Implemented Unlock screen → "Import Vault from Backup"
Pre-Delete Export ✅ Suggested Warning modal before vault deletion
Pre-Import Backup ✅ Automatic Old vault backed up before replacement
Passphrase Verification ✅ Implemented Verify against imported vault before overwriting

Backup Limitations

Limitation Impact Recommendation
Manual-only User must remember to backup Set calendar reminder
No encryption layer vault.enc already encrypted, but ZIP is not password-protected Store ZIP in secure location
Single-file Only vault.enc included Consider backing up app config too
No versioning Only one backup per export Keep multiple dated backups
No auto-backup No scheduled backup feature Manual discipline required

Note

Why Manual is Acceptable: Since vault.enc is already AES-256-GCM encrypted, the backup ZIP is safe to store in cloud storage (Google Drive, Dropbox) without additional encryption.

6. Optimal Backup Strategy

Question: What is the best backup strategy for this project?

Answer: 3-2-1 Rule Adapted for Vault

Recommended Strategy

┌─────────────────────────────────────────────────────────────────────┐
│                    3-2-1 BACKUP STRATEGY                            │
├─────────────────────────────────────────────────────────────────────┤
│  3 COPIES    : Original vault.enc + 2 backup copies                 │
│  2 MEDIA     : Local storage + Cloud storage                        │
│  1 OFFSITE   : At least one backup in different physical location   │
└─────────────────────────────────────────────────────────────────────┘

Implementation Checklist

  • Daily/Weekly Export: Settings → Backup Vault after significant changes
  • Local Storage: Keep on USB drive or separate partition
  • Cloud Storage: Upload to Google Drive/Dropbox/OneDrive (encrypted file is safe)
  • Version Naming: Keep multiple versions (e.g., last 5 backups)
  • Passphrase Backup: Store passphrase separately from vault (physical safe, password manager)
  • Test Restores: Periodically verify backups can be imported

Sample Backup Schedule

Frequency Action Storage
Daily (if changed) Export backup ZIP Local folder
Weekly Upload to cloud Google Drive encrypted folder
Monthly Fresh backup to USB USB drive in safe
Before major changes Manual export All locations

Tip

Cloud Safety: Since vault.enc uses AES-256-GCM, it's cryptographically safe to store on cloud services. An attacker with access to Google Drive cannot read your credentials without your passphrase.

7. Multi-Device Usage

Question: If I want to run this app on a different device using the same data, is that possible?

Answer: Yes, via manual backup/restore

Transfer Process

sequenceDiagram
    participant D1 as Device 1 (Current)
    participant B as Backup File
    participant D2 as Device 2 (New)

    D1->>B: Export vault-backup_*.zip
    Note over B: Transfer via<br/>USB/Cloud/Email
    B->>D2: Copy backup file
    D2->>D2: Install Secure Vault app
    D2->>D2: Import backup on Unlock screen
    D2->>D2: Enter original passphrase
    Note over D2: Vault restored!
Loading

Step-by-Step Transfer

On Device 1 (Source):

  1. Settings → Backup Vault → Download vault-backup_*.zip
  2. Transfer ZIP to new device (USB, cloud, etc.)

On Device 2 (Destination):

  1. Install/Start Secure Vault app
  2. On unlock screen, expand "Import Vault from Backup"
  3. Select the backup ZIP file
  4. Check "Use this as primary database"
  5. Click "Import"
  6. Enter your original passphrase → Unlock

Warning

No Sync: Changes on one device do NOT automatically sync to other devices. You must manually export/import after making changes.

8. Mobile Compatibility

Question: Can this application run on Android or iOS?

Answer: Not currently, but possible with modifications

Current Compatibility

Platform Support Notes
Windows ✅ Full Electron .exe installer available
macOS ⚠️ Partial Needs Electron macOS build (not configured)
Linux ⚠️ Partial Needs Electron Linux build (not configured)
Android ❌ None Requires major rewrite
iOS ❌ None Requires major rewrite
Web Browser ✅ Dev only npm run dev for local development

Mobile Feasibility

To support mobile (Android/iOS), would need:

  1. React Native or Capacitor - Replace Vite with mobile framework
  2. SQLite Mobile Library - Replace better-sqlite3 (native Node.js)
  3. Crypto Polyfills - Node.js crypto → Web Crypto API / react-native-crypto
  4. File System Abstraction - iOS/Android sandboxed storage
  5. Local Server Alternative - Replace Express with in-process API

Estimated Effort: 2-4 weeks for experienced developer

Note

Workaround: You can access the web UI from a mobile browser when running npm run dev on the same network, but this is NOT recommended for security (exposes to LAN).

9. Google Sync with Encryption

Question: Is it possible to sync data to Google with full encryption?

Answer: Yes, the encrypted file can be safely stored on Google

Current State

Method Encryption Status Implementation
Manual Upload ✅ Fully Encrypted Export ZIP → Upload to Google Drive
Auto-Sync ❌ Not Implemented Would need Google Drive API integration
Real-Time Sync ❌ Not Possible Single-device architecture

How to Sync to Google (Manual)

  1. Export backup: Settings → Backup Vault
  2. Upload vault-backup_*.zip to Google Drive
  3. On new device: Download from Google Drive
  4. Import via Unlock screen

Security Guarantee

Your Vault File Journey to Google:
┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│ Credentials │ ──► │ vault.enc   │ ──► │ Google      │
│ (Plaintext) │     │ (AES-256)   │     │ Drive       │
└─────────────┘     └─────────────┘     └─────────────┘
     Local               Local              Cloud
   Encrypted           Encrypted          Encrypted

Google sees: Random bytes that look like noise Google cannot: Decrypt without your passphrase (impossible)

Tip

Future Enhancement: Auto-sync could be implemented via Google Drive API, storing only the encrypted vault.enc. The encryption key (your passphrase) would never touch Google's servers.

10. Multi-Device Same Vault

Question: Can this app be used on multiple devices with the same vault data?

Answer: Yes, but manual sync only (no real-time)

Multi-Device Workflow

flowchart TD
    subgraph D1["Device 1"]
        A1["Vault.enc v1"]
    end

    subgraph D2["Device 2"]
        A2["Vault.enc v1"]
    end

    subgraph Backup["Shared Storage"]
        B["vault-backup_*.zip"]
    end

    A1 -->|"Export"| B
    B -->|"Import"| A2
    A2 -->|"Export (after changes)"| B
    B -->|"Import"| A1
Loading

Limitations

Feature Status Notes
Use same vault on 2+ devices ✅ Yes Via backup/import
Real-time sync ❌ No Not implemented
Conflict resolution ❌ No Manual only
Last-write wins ❌ No User must manage versions
Simultaneous editing ❌ No Would corrupt data

Caution

Conflict Warning: If you edit the vault on Device 1 and Device 2 independently without syncing, you'll have two different versions. Only ONE can be imported – the other's changes are lost.

Recommended Multi-Device Practice

  1. Always export before editing on another device
  2. Designate one device as "primary"
  3. Import latest backup before making changes
  4. Export immediately after changes

11. Power Loss Scenarios

Question: What happens if I lose power while using the app (for example, sudden blackout or laptop battery drain)?

Answer: Vault data is safe, but unsaved changes may be lost

Power Loss Scenarios

State When Power Lost Data Impact Recovery Action
Vault Locked ✅ Zero impact Normal startup
Vault Unlocked (idle) ⚠️ Pending writes may be lost vault.enc has last-saved state
During Write Operation ⚠️ That operation lost Operation must be repeated
During Lock Operation ❌ Potential temp file issue Crash recovery cleans up

What the App Does

On Normal Shutdown:

vault.tmp.db → Checkpoint WAL → Encrypt → vault.enc (atomic write)
      ↓
Delete all temp files
      ↓
Clear session tokens

On Crash Recovery (Next Startup): From crashRecovery.js:

// On server startup:
// 1. Check for vault.tmp.db* files
// 2. Delete all found (no recovery attempt)
// 3. vault.enc remains safe and unchanged

File State After Power Loss

File Status Notes
vault.enc ✅ Safe Last encrypted state preserved
vault.tmp.db ⚠️ Deleted on restart Unsaved changes lost
vault.tmp.db-wal ⚠️ Deleted on restart Write-ahead log discarded
vault.tmp.db-shm ⚠️ Deleted on restart Shared memory cleaned

Important

Design Philosophy: The app prioritizes data integrity over data recency. It's better to lose unsaved changes than to risk a corrupted vault. The encrypted vault.enc is the source of truth.

12. Web UI Vulnerabilities

Question: How likely is it for security vulnerabilities to exist in the web UI?

Answer: Low risk due to architecture, but not zero

Security Measures in Place

Protection Implementation Risk Mitigated
Content Security Policy Helmet.js CSP headers XSS, code injection
CORS Localhost origins only Cross-origin attacks
No External Connections 127.0.0.1 binding Network exposure
Session Tokens Memory-only, random Session hijacking
Input Sanitization Backend validation SQL injection
Rate Limiting 5-100 requests/15 min Brute force

Helmet.js Configuration

From security.js:

contentSecurityPolicy: {
  directives: {
    defaultSrc: ["'self'"],
    styleSrc: ["'self'", "'unsafe-inline'", "fonts.googleapis.com"],
    scriptSrc: ["'self'"],
    imgSrc: ["'self'", "data:", "https:"],
    connectSrc: ["'self'"],
    fontSrc: ["'self'", "fonts.gstatic.com"],
    objectSrc: ["'none'"],
    frameSrc: ["'none'"],
  },
}

Remaining Risks

Risk Likelihood Impact Notes
XSS via dangerouslySetInnerHTML Very Low Medium React escapes by default
Dependency vulnerabilities Low Varies Regular updates needed
React state exposure Very Low Low Memory-only, no persistence
Local file inclusion Very Low High No user-controlled paths

Tip

Why Low Risk: Since this runs locally and only accepts connections from 127.0.0.1, there's no network attack surface. An attacker would need to already be on your machine.

13. Route Access Rules

Question: How strict are the application route access rules?

Answer: Strict, with layered protection

Route Protection Layers

flowchart LR
    A["HTTP Request"] --> B{"127.0.0.1?"}
    B -->|No| C["❌ Connection Refused"]
    B -->|Yes| D{"Rate Limited?"}
    D -->|Yes| E["❌ 429 Too Many Requests"]
    D -->|No| F{"Vault Unlocked?"}
    F -->|No| G["❌ 403 Vault Locked"]
    F -->|Yes| H{"Session Token Valid?"}
    H -->|No| I["❌ 401 Unauthorized"]
    H -->|Yes| J{"Tab Owner?"}
    J -->|No| K["❌ 409 Tab Conflict"]
    J -->|Yes| L["✅ Request Processed"]
Loading

Route Categories

Category Auth Required Token Required Owner Required Example
Public ❌ ❌ ❌ /api/vault/status, /health
Vault Ops ✅ Passphrase ❌ ❌ /api/vault/unlock, /api/vault/create
PIN Ops ✅ Vault unlocked ❌ ❌ /api/settings/pin/verify
CRUD ✅ Full ✅ ✅ /api/credentials/*, /api/platforms/*
Sensitive ✅ Full ✅ ✅ /api/credentials/:id/reveal

Rate Limiter Details

From rateLimiter.js:

Limiter Max Requests Window Applied To
PIN Verification 5 15 min /api/settings/pin/verify
General API 100 15 min All /api/* routes
Credential Ops 50 15 min /api/credentials/*

Note

Multi-Tab Ownership: Only the "primary" tab (the one that entered PIN) can perform write operations. Other tabs receive 409 Conflict.

14. File Upload Validation

Question: How strict are the file upload validation rules in this app?

Answer: Strict with multiple validation layers

Validation Pipeline

From vault-import.js:

flowchart TD
    A["File Upload"] --> B{"Extension Check"}
    B -->|".exe, .dll, etc"| C["❌ Invalid file type"]
    B -->|".enc, .zip"| D{"Size Check"}
    D -->|">50MB"| E["❌ File too large"]
    D -->|"<50MB"| F{"ZIP Extraction"}
    F -->|"Failed"| G["❌ Invalid ZIP"]
    F -->|"Success"| H{"vault.enc found?"}
    H -->|"No"| I["❌ Missing vault.enc"]
    H -->|"Yes"| J{"Structure Check"}
    J -->|"Invalid magic bytes"| K["❌ Not a vault file"]
    J -->|"Valid VLT1 header"| L["✅ Valid import file"]
Loading

Validation Details

Check Implementation Rejection Message
File type Multer fileFilter "Only .enc and .zip files allowed"
File size Multer limits.fileSize "File too large (max 50MB)"
ZIP structure AdmZip extraction "Failed to extract vault.enc"
vault.enc presence ZIP entry search "ZIP must contain vault.enc"
Magic bytes Buffer check for "VLT1" "Invalid vault file format"
Container version Version byte check "Unsupported container version"

File Filter Code

fileFilter(req, file, cb) {
  const allowedMimes = ['application/octet-stream', 'application/zip', 'application/x-zip-compressed'];
  const allowedExts = ['.enc', '.zip'];

  const ext = file.originalname.toLowerCase().match(/\.[a-z0-9]+$/)?.[0];

  if (!ext || !allowedExts.includes(ext)) {
    return cb(new Error('Only .enc and .zip files are allowed'));
  }
  cb(null, true);
}

Tip

Defense in Depth: Even if a malicious file passed the filter, the vault unlock would fail because decryption requires the correct passphrase. Wrong passphrase = GCM authentication failure.

15. XSS Protection

Question: Is the application protected against XSS attacks?

Answer: Yes, with multiple layers

XSS Protections

Protection Implementation Coverage
React Auto-Escaping JSX syntax All rendered content
Content Security Policy Helmet.js scriptSrc: ["'self'"]
X-XSS-Protection Helmet.js Browser XSS filter enabled
No dangerouslySetInnerHTML Code review Minimal use
No innerHTML Code review Avoided entirely
Strict Origin Policy CSP No inline scripts

CSP Script Policy

scriptSrc: ["'self'"]; // Only allow scripts from same origin

This means:

  • ❌ Cannot inject <script>alert('xss')</script> via data
  • ❌ Cannot load external scripts
  • ❌ Cannot use inline event handlers injected via data
  • ✅ Only bundled app scripts execute

React Protection Example

// User input is automatically escaped by React
const userInput = "<script>alert('xss')</script>";
return <div>{userInput}</div>; // Renders as text, not executed

Note

Offline Advantage: Since the app doesn't connect to external servers, there's no attack vector for reflected XSS from external sources. All data originates from the encrypted local vault.

16. Backdoor/Tampering Protection

Question: Is the application protected against backdoor or tampering attacks?

Answer: Yes for data, partially for code

Tamper Detection

Target Protection Mechanism
Encrypted Vault ✅ Strong GCM 16-byte authentication tag
Database Contents ✅ Strong Any modification = decryption failure
App Code (Source) ⚠️ Audit required Open source, review before use
App Code (Built) ⚠️ Trust Electron Download from official release
Dependencies ⚠️ npm ecosystem Regular npm audit needed

GCM Authentication

From container.js:

try {
  const decipher = createDecipheriv(AES_ALGORITHM, key, nonce);
  decipher.setAuthTag(authTag); // 16-byte integrity check

  // If ANY byte was modified, this throws:
  // "Decryption failed: Invalid passphrase or corrupted data"
} catch (err) {
  throw new Error("Decryption failed: Invalid passphrase or corrupted data");
}

What Can't Be Tampered (Without Detection)

  • ✅ vault.enc file contents → GCM tag verification fails
  • ✅ Salt/nonce values → Decryption produces garbage
  • ✅ Ciphertext length field → Parse error
  • ✅ Magic bytes → "Invalid container format" error

What Could Theoretically Be Tampered

  • ⚠️ package.json scripts → Run malicious commands
  • ⚠️ node_modules/* → Supply chain attack
  • ⚠️ Built Electron .exe → If downloaded from untrusted source

Warning

Supply Chain Risk: Always download releases from official GitHub repository. Verify checksums if available. Run npm audit regularly to check for vulnerable dependencies.

17. Offline Security

Question: Since this app runs locally and is 100% offline, can it be considered fully secure?

Answer: More secure than cloud-based, but not "fully secure"

Offline Advantages

Advantage Impact
No network exposure Eliminates remote attacks
No server breaches Your data isn't on any server
No man-in-the-middle No network to intercept
No account compromise No login to external service
No provider access Company can't read your data

Remaining Risks (Offline ≠ Invulnerable)

Risk Category Examples Mitigation
Physical Access Someone uses your unlocked computer Auto-lock, manual lock, screen lock
Malware Keylogger captures passphrase Antivirus, OS updates
Memory Attacks Cold boot attack on RAM Power off when not in use
Weak Passphrase Dictionary attack on vault.enc Use 12+ word passphrase
User Error Passphrase in plaintext file Secure passphrase storage
Backup Exposure Unencrypted backup on shared drive vault.enc is encrypted, but practice care

Security Comparison

Factor Secure Vault (Offline) Cloud Password Manager
Network attack surface ✅ None ❌ Internet-exposed
Server breach risk ✅ None (no server) ❌ Provider database breach
Encryption key custody ✅ You only ⚠️ Usually derived at server
Malware on device ⚠️ Still vulnerable ⚠️ Still vulnerable
Availability ✅ Always (local) ⚠️ Depends on internet/service

Tip

Threat Model: Secure Vault assumes a trusted device in an untrusted world. If your device itself is compromised (malware, physical access), additional OS-level security is needed.

18. Biggest Security Weakness

Question: What is the biggest security weakness or limitation of this application?

Answer: No passphrase recovery + user discipline requirements

Top Security Weaknesses (Ranked)

🥇 #1: Lost Passphrase = Total Data Loss

┌─────────────────────────────────────────────────────────────────┐
│  ⚠️  CRITICAL: NO PASSPHRASE RECOVERY MECHANISM EXISTS  ⚠️     │
│                                                                 │
│  This is BY DESIGN for security, but creates user risk:        │
│  • Forget passphrase → All credentials permanently lost        │
│  • No "forgot password" email                                   │
│  • No master key recovery                                       │
│  • No backdoor (that's the point)                               │
│                                                                 │
│  MITIGATION: Write down passphrase, store in physical safe     │
│              or use another password manager for the passphrase │
└─────────────────────────────────────────────────────────────────┘

🥈 #2: Dependence on Manual Backups

  • No automatic backup scheduling
  • User must remember to export regularly
  • Single point of failure (local vault.enc)

Mitigation: Set calendar reminders, use 3-2-1 backup strategy

🥉 #3: Unlocked Vault Vulnerability Window

  • While unlocked, vault.tmp.db contains plaintext data
  • Someone with physical access can read credentials
  • Memory may contain decrypted data

Mitigation: Use auto-lock (configurable 5-60 min), lock manually before leaving

Other Weaknesses

Rank Weakness Severity Notes
4 Session token in memory Medium Browser devtools could expose
5 No 2FA for passphrase Medium Single authentication factor
6 Supply chain dependencies Medium npm packages could be compromised
7 'unsafe-inline' for styles Low Slightly weaker CSP
8 No audit logging Low No record of access attempts
9 Single-device architecture Low Manual sync required

Summary

Security Scorecard

Category Score Notes
Encryption Strength ⭐⭐⭐⭐⭐ AES-256-GCM + Argon2id is state-of-the-art
Network Security ⭐⭐⭐⭐⭐ 127.0.0.1 only, no external connections
Data at Rest ⭐⭐⭐⭐⭐ Fully encrypted with authentication
Access Control ⭐⭐⭐⭐ Multi-layer (passphrase + PIN + tab ownership)
Backup System ⭐⭐⭐ Functional but manual-only
Recovery Options ⭐⭐ PIN recoverable, passphrase = no recovery
User Experience ⭐⭐⭐⭐ Clear UI, but requires discipline
Multi-Device ⭐⭐ Works but no sync

Final Verdict

Secure Vault is a high-security, local-first credential manager with military-grade encryption. Its security model trades convenience (password recovery, cloud sync) for maximum protection. Suitable for users who understand the responsibility of managing their own encryption keys.

Appendix: File References

File Purpose
container.js AES-256-GCM encryption/decryption
vaultManager.js Vault lifecycle and session management
security.js Helmet, CORS, body limits
rateLimiter.js Rate limiting configuration
vault-import.js Backup import/validation
README.md Full app documentation