Previous | ToC | Next Labs: Cryptography. Part 1. Math Alive

HBO Application: the Next Month

The next month HBO changes the password to a new one. Suppose you are not subscribed any more. This means that HBO will not send the password parity-added to your key in this month's stream. But on the previous page you calculated three other keys. If those customers are still subscribed, then their keys should work. Try using the keys you calculated from the previous page to get the new password and unscramble the signal below.

Previous | ToC | Next Last Modified: August 2008