Developer website: Steve Dekorte
Crypt is a application for encrypting and decrypting files or folders with a password of your choice. Crypt3 uses 256bit AES encryption in cipher-block chaining mode. The encryption format is open and can be decrypted on any platform that has openssl, tar and zip (to decrypt, you will of course need the password you used to encrypt with). It also supports securely erasing the original unencrypted files and folders.
Mac OS X 10.3 or later