Generate cryptographically secure one-time tokens for web security scenarios — CSRF tokens, OAuth/OIDC state parameters, session nonces, and PKCE code_verifier/code_challenge (S256). Uses crypto.randomBytes, never Math.random.

Security

Password Strength Meter

Estimate real password strength with Shannon entropy, zxcvbn pattern matching (l33t, dictionary, sequences, repeats) and brute-force crack-time across attack scenarios (offline fast/slow hash, online). The password is evaluated locally and never sent anywhere.

Validation

Passport Validator

Validate passport numbers from different countries (China, USA, Japan, etc.)

Security

Password Generator

Generate secure random passwords

Cryptography

PBKDF2 Generator

Generate PBKDF2 key derivation hash

Cryptography

PBKDF2 Validator

Validate password against PBKDF2 derived key

Security

Password Validator

Validate password strength and check against common security requirements

Validation

Phone Validator

Validate and format phone numbers internationally

Validation

Mod-11 Checksum Calculator

Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes.

Security

BIP39 Mnemonic Phrase Generator

Generate or validate 12 to 24 word BIP39 mnemonic phrases with entropy and PBKDF2-HMAC-SHA512 seed output

Validation

MAC Address Validator

Validate MAC addresses and identify vendor information

Security

Key Pair Generator

Generate public/private key pairs for various cryptographic algorithms