A simple and handy file encryption/decryption tool for Linux
SubCrypter is also capable of generating encryption keys for you to use. The usage is simple:
subcrypter makekey [cipher] [keyfile]
subcrypter encrypt [infile] [outfile] [keyfile]
subcrypter decrypt [infile] [outfile] [keyfile]
subcrypter help (To list available ciphers)
It supports the following cyphers: AES, Blowfish, CAST5, DES, RC2 and RC4.