RSA Experimenter vs Cipher Forge

This app is intended as a tool for understanding a method of encrypting messages known as Public Key Cryptography (RSA). Invented in the 1970's this method still (in 2023) underlies much of the secure electronic transfer of information including communication with a bank (either online or from ATM machines), ordering goods online, transfering medical records and much more. The app is NOT designed for actually sending secure messages; the version of the method implemented here is intensionally a 'toy' version which is more easily understood than the full version. You will see how messages are encoded and decoded and their authenticity verified by using the app to exchange messages with colleagues and friends. The extensive help pages explain most of the mathematics behind this method. It involves concepts often presented to 2nd or 3rd year university students but is accessible to smart and curious middle-school students; the original version of this app was in fact written to accompany a series of sessions of the author with the seventh-grade math class of one of his grandchildren.

CipherForge turns secret messages into an adventure. Choose from over a dozen cipher modes, chain them together for maximum mystery, or build your very own personal code in The Forge. CIPHER MODES INCLUDED: - Caesar Cipher: classic letter shift - Vigenere Cipher: keyword-powered encryption - Atbash: ancient A=Z, B=Y reversal - Rail Fence: zigzag message scrambling - Pig Latin: the classic playground code - Morse Code: dots and dashes like a telegraph operator - Substitution: swap every letter with a custom alphabet - Reverse: read it backwards - Number Cipher: replace letters with numbers - Elvish Script: mystical runic encoding - Invisible Ink: hide your message with decoy letters - Levi's Conundrum: alternating number substitution - The Caleb Protocol: swap every pair of letters - The Forge: design your own code where every letter maps to your secret symbol or word THE FORGE Create a completely personal cipher. Assign any word, symbol, or string to each letter of the alphabet, then share your custom codebook with friends so they can decode your messages. CHAIN CIPHERS TOGETHER Build multi-layer codes by stacking ciphers. Vigenere + Rail Fence + Caesar? Your message becomes nearly impossible to crack without knowing the full chain. SHARE WITH FRIENDS Generate a QR code or short text share code for any cipher mode. Friends scan or enter the code to import your exact cipher setup. No accounts needed. MESSAGE HISTORY Every message you encode or decode is saved locally so you can refer back to it later. Clear it any time. COMPLETELY PRIVATE CipherForge works 100% offline. No accounts. No ads. No tracking. No data ever leaves your device. Perfect for kids learning about cryptography, families playing secret message games, teachers introducing code-breaking concepts, and anyone who loves puzzles.