Android app
Type in plain text, send ciphertext, in any messaging app. Build your very own cipher from more than 160 methods, from the Caesar cipher to Sherlock Holmes’ dancing men. Nothing leaves your phone.
Features
A keyboard, an app and a text-selection menu: encrypt and decrypt without leaving your conversation.
Keyboard
Plain text stays in the keyboard; the ciphertext shows up above the keys, like a translation. Confirm and it is inserted in the open app (messaging, email, notes…). As text, or as an image for symbol ciphers such as the dancing men.
Your methods, your rules
Chain methods in whatever order you like: Caesar, then Vigenère with your own key, then Enigma… More than 160 methods, powered by the same engine as the website workshop. Name your cipher: it is ready in the keyboard and in the app.
Text-selection menu
Select some text: “Encrypt” and “Decrypt” show up in the menu, next to “Copy”. A received message reads in one tap.
Glyph pad
A message in symbols on paper, in a photo or on a screen? The glyph pad lets you copy it sign by sign, then decrypt it.
Share by QR code or link
Every cipher has its own QR code and link. Your friend scans it with the camera or from the app’s home screen, or opens the link you sent: the app opens, and you both share the same methods and keys to write to each other. Without the app, the link opens the cipher in the website’s workshop. No account, no server: the cipher travels in the link, never through our servers.
Midnight
Caesar (3) → Vigenère (LUNE)
Privacy
As declared in the “Data safety” section of the Google Play listing.
Nothing to sign up for, nothing to remember: the app works right away.
The app has no permission to access the network: it cannot send anything.
Only the ciphertext is inserted in the app you are typing in.
Backup and sync go through a file you choose, password-protected if you wish.
Android 8.0 or later.
Yes: free, with no ads and no account to create.
Not at the moment: the app is Android only. On iPhone, the website workshop runs in your browser. Try the engine in your browser
No. It does not even have permission to access the network: every encryption and decryption runs on your phone, and there is no account to create.
More than 160, powered by the same engine as the website: substitutions (Caesar, Atbash, affine), polyalphabetic ciphers (Vigenère, Beaufort), transpositions, machines (Enigma), field ciphers (ADFGVX, Playfair), codes (Morse) and symbol alphabets (dancing men, Pigpen…). Browse every method
Historical methods are made for fun and learning: a well-encrypted message will puzzle your friends, but not a determined cryptanalyst. To protect sensitive data, use a modern encrypted messenger.
Your ciphers stay on your phone. To back them up or sync them, the app writes them to a file you choose (Drive, Dropbox, local storage…), password-protected if you wish. To give a single cipher to someone, show them its QR code: they scan it from the app.
It is available on Google Play.
Install the app and build your first cipher in seconds.
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