Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

NOVA scienceNOW's "Can Science Stop Crime" introduced you to Tadayoshi Kohno, a University of Washington computer scientist who's made it his mission to take over networked machines, identifying ...

The arena of creating secure environments in the hardware and software industries is somewhat shrouded in mystery and misunderstanding. Certainly, some types of ciphers are relatively straightforward ...

plaintext AND to decrypt a ciphertext. That is four operations, and most resources show one. Every sheet here does all four. 8-bit ASCII code is given, and so is the one-time pad’s; the student poses ...

You could do worse than to confuse the meanings of "code" and "cipher"—even cryptographers sometime use the terms as though they had the same meaning. There is, however, a definite distinction between ...

Unplugged 6-page Cybersecurity Mini-Unit on symmetric/asymmetric encryption, frequency analysis, and ciphers. Includes student activity and 2-page answer key. Demystify data privacy and secret codes!