A complete cryptography, encoding and media steganography suite — running entirely in your browser. Encodings, classical ciphers, real AES-256-GCM and RSA encryption, file encryption, hashes, hidden messages in PNG and WAV files, QR tools, and an analyzer that tells you what that mystery string probably is.
Coming next: an opt-in way to share an encrypted payload by link, with an expiry time, revocation, and a notification to the sender when — and only when — the recipient's decoder successfully verifies and opens it on this site.
How it will work: you encrypt first (the AES tool above), share only the ciphertext with a single-use, unguessable link, and set when it expires. The confirmation email will contain no message content, no passphrases and no keys — only the fact that a verified decode happened. Client-side reports can't prove a human read or understood a message, and anything decoded offline (saved file, another tool) cannot trigger a notification. This needs a small backend with rate limiting and replay protection, which this static page doesn't have yet — so there is deliberately no form here yet. When it ships, it will be announced on this page.