Code Breaking

What’s inside

• Using a Caesar cipher with a shift of 3, what plaintext does “KHOOR” represent?
• What does the Atbash ciphertext “GSV” decode to?
• Which technique is generally most useful when attacking a long monoalphabetic substitution cipher?
• In a Vigenere cipher, what is the main purpose of the keyword?
• Match each cipher or cipher family with its defining characteristic.
• Match each cryptanalytic tool with its typical use in code breaking.
• Match each encoding system with the correct description.
• Arrange the standard steps for decoding a suspected Caesar cipher.