Quick note about the latest 24 episode (7×14). When FBI needed to decrypt an email that was sent using the Blowfish cipher, a “level 6 analyst” walks into a computer and says:

“The designer of this algorithm built a backdoor into the code. Decryption is a piece of cake if you know the override codes.”

Five seconds later, the file is decrypted :)

I guess Bruce Scheier, the author of the original cipher, should not be happy to hear this on a TV show :P