5-bit binary substitution cipher and font-casing steganography.
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.
The historical 24-letter cipher uses the classical Latin alphabet where I and J share a code (01000) and U and V share a code (10011). The 26-letter version assigns a unique code to each letter.
Each letter of the hidden secret is converted to 5 binary bits. Lowercase letters in the cover text represent '0' ('A'), while uppercase letters represent '1' ('B').
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.
