Free Check k-Anonymity Password Safe Offline
Check k-anonymity password safe offline pwned database securely · Generator · Strength Analyzer · 100% Client-Side
- Generator: Creates truly random passwords using your browser's built-in security features. Customize length, character types, and generate multiple at once
- Strength Analyzer: Type or paste any password to see its strength score, estimated crack time, and tips to improve it
- Breach Checker: Safely checks if your password has appeared in known data breaches. Only a tiny fragment of your password's fingerprint is ever sent — not the password itself
View Technical Specifications (For Developers)
- CSPRNG: Uses
crypto.getRandomValues()— a cryptographically secure pseudorandom number generator, notMath.random() - Entropy Calculation:
entropy = length × log2(charsetSize)— scores map to NIST guidelines for password strength - k-Anonymity Protocol: Password is SHA-1 hashed locally, then only the first 5 characters of the hex hash are sent to the HIBP Pwned Passwords range endpoint. The remaining suffix is checked locally against the response
- SHA-1 Hashing: Uses
crypto.subtle.digest('SHA-1', ...)from the Web Crypto API - Ambiguous Character Exclusion: Optional filter removes
0O1lIto prevent visual confusion in generated passwords - Configurable Charset: Uppercase, lowercase, digits, and symbols can be individually toggled
window.crypto.getRandomValues(). Breach checking uses the k-Anonymity protocol — only
a 5-character SHA-1 prefix is ever transmitted; your full password stays in your browser.
Cryptographic Password Generator
Strength Analyzer
k-Anonymity Breach Checker
Uses the HaveIBeenPwned Pwned Passwords API. Only the first 5 chars of the SHA-1 hash are ever sent — your actual password is never transmitted.
Fuel the Project
Enterprise-grade security tools, free and client-side.
About Master Password Security Hub
The Master Password Security Hub represents the zenith of localized credential generation. It provides a highly rigorous, offline interface designed to produce unbreakable cryptographic hashes and unique passphrases that effortlessly mitigate brute-force vector attacks. Rather than trusting opaque third-party cloud generators with your critical infrastructural access secrets, this Hub uses the browser's native and untouchable `crypto.getRandomValues()` protocol. Instantly generate massive, salted 64-character entropy keys, define strict symbol distributions, and assess offline password strength without any network latency or external exposure.
How to Use This Tool
- Configure Entropy Length: Adjust the character count securely, typically anywhere from 16 to massive 128-character strings.
- Set Inclusion Properties: Toggle strict mandates for uppercase metrics, specialized security symbols, or numerical blocks.
- Generate Local Cryptography: Hit generate. The `crypto` framework natively spins out your highly randomized permutation string.
- Evaluate Vector Strength: Review the instant offline strength meter verifying estimated cracking times via modern hardware.
- Export and Wipe: Safely map the credential locally, then hit clear to purge the RAM footprint entirely.
Frequently Asked Questions
Why is a client-side password generator safer than an online one?
Local processing inherently eliminates man-in-the-middle attacks, generic network scraping, and server-side logging entirely. Your created string physically only exists locally.
What cryptographic method powers this generation script?
The software strictly enforces usage of the native Web Crypto API (`window.crypto.getRandomValues()`), guaranteeing mathematically robust and statistically uniform numbers.