MCrypter_ is a portable app that allows you to encrypt almost anything you want from passwords to text messages.
The dual input interface is easy-to-use and straightforward; one side for encryption the other for decryption. Encryption is done with AES 256, AES 128, 3DES, AES_192, DES, RC2, and RC4 encryption algorithms. You can also create your own by randomly selecting it from the bottom section of the interface.
You can view the encryption key and generate a new code or create a new one by yourself by filling in random characters within the code. You also have the option to utilize an encryption key for when you want to recover encrypted data as well as when passing data to someone else so that they can decrypt it.