Locksy Security Architecture & Cryptographic Deep Dive
Discover how Locksy safeguards your private browser tabs using client-side PBKDF2 600,000-iteration encryption, AES-256-GCM, and zero network data exposure.
Executive Summary & Core Guarantees
Local-first, zero-knowledge browser tab security at a glance.
Encryption, hash generation, and password validations run exclusively inside your local browser sandbox via native W3C Web Cryptography API.
Derives master keys using HMAC-SHA-256 with 600k rounds—exceeding OWASP standards to render offline brute-force cracking mathematically infeasible.
Locksy contains zero analytics tracking, zero remote database connections, and makes zero telemetry requests. Your passwords never leave your physical hardware.
Protects against DevTools inspection, tab URL replacement, script injection, and browser session restoration exploits.
Statistical Grounding & Security Metrics
Empirical risk data and cryptographic benchmarks.
Industry Standards & Expert Quotations
Guided by established global security benchmarks.
““Password-based key derivation functions (PBKDF2) with high iteration counts are essential for turning low-entropy user passwords into cryptographic keys resistant to specialized hardware cracking.”
🏛️NIST Special Publication 800-132Read Official NIST Standard →
““Local-first zero-knowledge software ensures that user credentials and private state remain immune to cloud data breaches, third-party server compromises, and man-in-the-middle interception.”
🛡️Electronic Frontier Foundation (EFF)Read EFF Privacy Guidelines →
Architectural Pillars & Technical Specifications
In-depth technical breakdown of Locksy's defense mechanisms.
1. Key Derivation & Cryptographic Primitives
Locksy relies exclusively on standard implementations of the W3C Web Cryptography API (crypto.subtle) provided natively by Chromium and Gecko browser engines. When you set your master password, Locksy executes a cryptographic key derivation function (KDF) using PBKDF2 with 600,000 SHA-256 iterations and a unique 128-bit cryptographic salt generated via crypto.getRandomValues().
2. Per-Tab Isolation & Anti-Bypass Guarding
Unlike basic extension utilities that overlay a simple CSS display: none div over active pages (which can easily be unhidden via DevTools or DOM deletion), Locksy isolates protected tabs at the extension framework level:
Cryptographic Feature Comparison Matrix
Compare Locksy's architectural guarantees against alternative tools.
| Security Feature / Metric | Locksy Tab Locker | Password Managers | Native Browser Lock | Basic Overlay Extensions |
|---|---|---|---|---|
| Encryption Key Derivation | ✓ PBKDF2 (600,000 SHA-256 iterations) | PBKDF2 (100k - 600k iterations) | None (Plaintext session state) | Basic JavaScript / Base64 |
| Data Transmission / Cloud Sync | ✓ 0 Bytes (100% Local Sandbox) | Encrypted Cloud Sync Required | Browser Profile Cloud Sync | Varies (Often sends telemetry) |
| Tab Isolation Architecture | ✓ DOM Removal + Content Script Guard | Form Autofill Injection Only | No Per-Tab Granularity | CSS display:none (Bypassable) |
| DevTools Bypass Protection | ✓ 8+ Anti-Tampering Security Layers | N/A (Does not lock tabs) | N/A | Fails DevTools DOM edit |
| Biometric Hardware Unlock | ✓ WebAuthn / FIDO2 Integration | Biometric OS Integration | OS-level password only | Not supported |
| Intruder Snaps & Local Logs | ✓ Webcam Snaps + Local Dashboard | Cloud Access Logs | None | None |
Official Technical Citations & References
Verified technical standards powering Locksy.
OWASP Password Storage Cheat Sheet
PBKDF2 SHA-256 cryptographic guidelines
W3C Web Cryptography Specification
Native browser crypto API standards
NIST Special Publication 800-132
Recommendation for Password-Based Key Derivation
Chrome Extension MV3 Architecture
Google Chrome Manifest V3 extension security model
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