Most file encryptors use methods that rely on the theory of computational security, that is difficulty of key factorisation prevents decryption of the file. But this method may not work forever. XorIt is designed to use conventional XOR encryption on keys that are the same size as the file to be encrypted.

Most file encryptors use methods that rely on the theory of computational security, that is difficulty of key factorisation prevents decryption of the file. But this method may not work forever. CryptIt is designed to use conventional XOR encryption on keys that are the same size as the file to be encrypted. CryptIt also has a ability to use removable media (USB drives, CDs, floppies) as a key code book.