PSM Decryptor is an entirely graphical utility that sits on your desktop (if you want it to) and decrypts archive. Just drag&drop encrypted archives or keys to the Decryptor box and let go...

PSM Encryptor is a cryptography and steganography tool. PSM Encryptor will encrypt any group of files (including whole directory structures) but will also disguise the resulting encrypted archive as a working sound or image file. Encrypts video too.