22) b, c?
CHAPTER 3 TRADITIONAL SYMMETRIC-KEY CIPHERS 21. Encryps the message “this is an exercise”using one of the following ciphers. Ignore the space between words. Decrypt the message to get the original plaintext. a. Additive cipher with key – 20 b Multiplicative cipher with key – IS c. Affine cipher with key (15. 20 22. Encrypt the messäge “the house is being sold tonighr” using one of the following a. Vigenere cipher with key olla b. Autokey
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