Note: Encryption and Decryption is done in a similar manner. For example, if you encrypt bob.txt and output as bobby.txt and use 666 as the key, then to decrypt, you must reverse the order.

Listing 1 presents the encryption and decryption process. To generate a pseudorandom sequence, you load the register with a nonzero content, and the software then computes the XOR of the taps and ...