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 ...

1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...

Half advice show. Half survival guide. Half absurdity-fest. (Wait, how does this work again? We're not numbers people.) Each episode, we answer all your burning questions, from how to survive a public ...

​Some Wordle days feel smooth. Others feel like the puzzle is actively working against you. December 22’s Wordle (#1647) falls into the second category. If you found yourself stuck with grey tiles and ...

Find answers to the latest online sudoku and crossword puzzles that were published in USA TODAY Network's local newspapers.

For decades, one script embedded in the Dead Sea Scrolls resisted all efforts to unlock its meaning. Known as Cryptic B, the code had remained undeciphered for more than 70 years, puzzling generations ...