Pycrypt is a tool to easily encrypt and decrypt files.
The encryption/decryption key is stored in your keychain if you are running MacOS or in your GNome keyring.
If you forget your key you will not be able to decrypt your encrypted files.
note: The current version of pycrypt use AES.
Encrypt a file:
$ pycrypt encrypt -e 'super secure key' foo.txt
Decrypt a file:
$ pycrypt decrypt -e 'super secure key' foo.txt.aes