CryptoMemo

Enter a key phrase and some short text you wish to encrypt and the app will generate the encrypted text on the screen. Ideal for encrypting small pieces of information you wish to keep secret. You can copy this to your clipboard and paste it into a message, file or even hand write it out onto a piece of paper.

Encrypt secrets

Encrypt confessions

Encrypt GPS locations to buried treasure

Encrypt accounts and their passwords

Encrypt everything you are paranoid about and store it beyond all online attackers by writing it down securely on a piece of paper for all time or engrave the ciphertext onto a rock and bury the rock somewhere safe.. let your paranoia run free!

The app uses AES encryption classes, the most widely used and mature encryption algorithm to which there are no known attacks.

The default checkbox setting includes an IV and HMAC which are good if you intend to use the same passphrase on multiple secrets as well as ensuring message authentication.

If this is a one time affair and space and speed is at a premium (perhaps you wish to memorize the ciphertext) then uncheck these options and still enjoy the same AES impregnable security.

In the interest of security and transparency the entire project source code is available for download and your inspection at http://www.cryptomemo.com/

The IV and HMAC utilizing AES class code itself is thanks to https://github.com/tozny/java-aes-crypto with AES 128, CBC, and PKCS5 padding, and a random 16-byte IV with SHA1PRNG. Integrity with HmacSHA256.

The simple empty IV AES class is courtesy of https://github.com/scottyab/AESCrypt-Android 256-bit AES key, CBC mode, PKCS7Padding, Blank IV

If you have any cryptographic suggestions for the app please get in contact and we will be happy to make changes for the interest of everyones security..