Covert Mail vs CipherKit

Learn Morse code the way radio operators do, crack the ciphers people really used, then send a coded message of your own. Covert Mail is a field desk of secret codes. Each code is a dossier: read its history, practice it a few characters at a time, then decode a real message to file it in your archive. MORSE CODE, BY EAR • The Koch method: every character at full speed from the first lesson, two at a time, so you hear each one as a single sound instead of counting dots • Farnsworth spacing: characters at your chosen speed with extra room between them while you learn • Tones made on your phone at any speed and pitch, with an on-screen signal lamp and optional vibration • Decode SOS and Samuel Morse's first message, "What hath God wrought" SEND IT ON A BRASS KEY Hold the on-screen key to send. Keying missions teach every letter from A to Z, and the results show your marks against the ideal timing, so you can see where your rhythm drifted. The last one has you key the Titanic's call: "Come at once. We have struck a berg." FIFTEEN DOSSIERS Morse code, the NATO phonetic alphabet, the Caesar shift, Atbash, tap code, pigpen, Braille, the Polybius square, flag semaphore, a keyword cipher, Vigenère, the rail fence, ROT13, a substitution cipher and a book cipher. Each comes with its history: Caesar's shift of three, the tap code American prisoners used through the walls of Hỏa Lò, Polybius signaling with torches, Louis Braille's six dots. Your handler, Harriet Vale, leaves a note as you open each dossier. Every dossier you clear turns up one word of a letter the desk's founder cut into fifteen pieces. PRACTICE THAT KNOWS WHAT YOU MISS Practice batches are planned around the characters you get wrong, and a miss comes back a few clues later until it sticks. A new intercept arrives every day, the same for everyone, and an optional daily reminder tells you when it is in. THE CIPHER DESK A Morse code translator and cipher decoder in one. Encode or decode anything in fifteen codes, including a random substitution alphabet and a book cipher with any book you choose. Play Morse aloud, flash it on your phone's torch, or key it in yourself. Then send a coded message to a friend through any messaging app, with or without the key. Friends without the app can open it in their browser. ON YOUR WRIST On Apple Watch, Covert Mail taps Morse on your wrist: a light tick for a dot, a heavier tap for a dash. Pick the letter from four and build a streak, or key Morse back by tapping the watch face. Today's letter can sit on your watch face as a complication. The watch app also works without your phone, offline, with no ads. No account. Your progress stays on your phone. Classical codes only: these are for learning and fun, not for protecting real secrets. Covert Mail first came to the App Store in 2009. This is the rebuilt version.

Crack any cipher, encrypt anything, and train your brain with daily puzzles. CipherKit is a complete cryptography lab, codebreaking toolkit, puzzle game, and encrypted vault that works fully offline. SOLVE UNKNOWN CIPHERTEXT Paste, type, or scan a message and let CipherKit figure it out: • Auto-detects the likely cipher and recovers the key • Solvers for Vigenère, Beaufort, Gronsfeld, monoalphabetic substitution, affine, rail fence, and columnar transposition • Interactive Substitution Workbench: tap letters to map them, lock what you know, auto-fill by frequency, or let the hill-climbing solver finish • Frequency analysis and index of coincidence in five languages • Recognizes Base64, hex, binary, URL, and decimal encodings • Honest results when text looks like modern encryption • Save sessions with notes and come back later ENCRYPT WITH 48 CIPHERS From antiquity to the present day: • Substitution: Caesar, ROT13, Atbash, Affine, Keyword, Baconian, Homophonic • Polyalphabetic: Vigenère, Beaufort, Autokey, Running Key, Gronsfeld • Transposition: Rail Fence, Columnar, Scytale, Route • Polygraphic: Playfair, Two-Square, Four-Square, Bifid, Trifid, Hill, ADFGX, ADFGVX, Nihilist, Polybius • Machines: Enigma, M-209, Jefferson Disk • Stream: RC4, ChaCha20, Salsa20, One-Time Pad, Vernam, LFSR • Block and AEAD: AES, DES, Blowfish, Twofish, Camellia, AES-GCM, ChaCha20-Poly1305 • Public key: RSA and Diffie-Hellman demonstrations • Morse code and Tap Code, with audio playback WATCH CIPHERS WORK Animated visualizers show every step: rotating Caesar rings, the Vigenère tabula recta, rail fence zig-zags, Playfair grids, columnar read-offs, Enigma rotors stepping, and Morse timelines. Chain several ciphers into a recipe and save it. PLAY EVERY DAY • Daily challenge with streaks, history, and shareable results • 125 hand-verified puzzles across 10 packs, from Easy to Diablo • Sprint, No-Hint Challenge, and endless Cipher Drill modes • Share puzzles with friends by link or QR code • Achievements, mastery levels, and Game Center leaderboards LEARN CRYPTOGRAPHY Interactive lessons with quizzes for every cipher family, a timeline from the scytale to post-quantum encryption, and history, weaknesses, and worked examples for each cipher. KEEP SECRETS SAFE The Vault stores notes with AES-256-GCM encryption, protected by Face ID, Touch ID, or your passcode. Organize with folders and tags, auto-lock on a timer, and export encrypted backups. WORKS EVERYWHERE • Home Screen and Lock Screen widgets with today's challenge and your streak • Control Center control to jump into the daily challenge • Share extension: decode text from Safari, Messages, or any app • Apple Watch app with a Morse tapper that sends to your iPhone • Live camera capture for printed ciphertext • Siri and Shortcuts: encode, decode, analyze, or check your streak • Native Mac app with keyboard shortcuts PRIVATE BY DESIGN No account. No tracking. No servers. Everything stays on your device unless you turn on optional iCloud sync. CIPHERKIT PRO CipherKit is free to download, and the core toolkit stays free. CipherKit Pro is a one-time $9.99 purchase, no subscription, and unlocks expert and Diablo packs, the Machine Room pack, modern crypto ciphers, visualizers, chain recipes, and vault backup. Visualizers and chain recipes include three free tries each. Paid for CipherKit before it went free? Pro is already yours. Great for cryptography students, puzzle lovers, escape room fans, teachers, security enthusiasts, and anyone who likes making their brain earn its keep. Download CipherKit and start cracking.