Encrypt, decrypt, and auto-crack classical Affine ciphers.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Encryption uses E(x) = (ax + b) mod 26, while decryption uses D(y) = a^(-1)(y - b) mod 26, where a and 26 must be coprime.
It rapidly evaluates all 312 possible (a, b) key pairs and ranks the decrypted plaintexts using English letter and bigram frequency analysis.
Zero-egress companion tools in the Security & Network suite
Audit CSP, HSTS, X-Frame-Options, and security headers with OWASP grading (A+ to F).
Measure cryptographic randomness, Shannon entropy (0-8 bits/byte), Chi-square test, and byte distributions.
Generate secure RFC 6238 Base32 TOTP secret keys and standard otpauth:// URIs for Google Authenticator.
Construct and validate HTTP CSP headers and meta tags.
