Chapter 9 Crossword

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Across
  1. 2. The bits that are combined with plain text to encrypt it
  2. 5. This cipher is a special version of Multi-Alphabet substitution that uses a series of different Caesar ciphers based on letters of a keyboard
  3. 8. The study of encryption and decryption
  4. 9. Pretty Good Privacy
  5. 11. Plain text is _______
  6. 13. A mathematical process for doing something
  7. 14. To decode or decipher a message
  8. 16. Also call Public Key Encryptions where different keys are used to encrypt and decrypt
  9. 18. The same key is used to encrypt and decrypt
  10. 19. A one-way only type of cryptograhic algorithm
Down
  1. 1. This cipher is one of the oldest encryption methods that uses a number to shift each letter of a message
  2. 3. Cipher text is _________
  3. 4. Numbers consisting of only 1's and 0's
  4. 6. Altering a message so that it cannot be read without the key
  5. 7. The process of proving that someone is who they claim to be
  6. 10. This cipher differs from a stream cipher because it encrypts 64 bits at a time
  7. 12. Protocol that calculates a hash after the user has logged in
  8. 15. Data Encryption Standard
  9. 16. Standard code for every letter, number, and key on a keyboard
  10. 17. Designed by Bruce Schneier in 1993