ImmediateCrypt can easily encrypt and decrypt plain text messages with the AES-256 algorithm (CBC block chaining, PKCS5 padding).
You can download it from the following link: https://packetstormsecurity.com/files/download/114543/ImmediateCrypt_v1.0.zip
Source: https://packetstormsecurity.com/files/114543/ImmediateCrypt-1.0.html