Gpg (GNU Privacy Guard) is a OpenPGP implementation. There are several frontend applications, although I never tried any of them; I prefer the command line. To encrypt: gpg --symmetric --armor --cipher-algo AES 12-words.txt It will prompt for a passphrase and create a 12-words.txt.asc file with encrypted data (ASCII characters). To decrypt: gpg --...


A more bare-bones means of symmetric encryption with Rijndael is ccrypt. You can use Base64 to format the binary data in a way that's relatively easy to read and write by hand. $ printf 'first second third fourth fifth banana orange pineapple watermelon aircraft tree blue' | ccrypt | base64 Enter encryption key: abc Enter encryption key: (repeat) abc ...


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