# Exam1RevQs - "KNIGHTS" Team : ______________ 2)...

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Crypto Exam #1 Review Questions 1) Using an affine cipher with the encryption keys a = 9, b = 5, encrypt the plaintext "KNIGHTS" (rszhqul) 2) If the encryption keys for the affine cipher are a = 9 and b = 5, what are the corresponding decryption keys? (a=3, b=11) 3) Consider using the affine cipher on an alphabet of size 20. How many possible keys would there be? (160) 4) Find 36 -1 mod 79 (11) 5) The ciphertext for a Vigenere cipher is "HZXKEP". If the encryption keyword is "CIPHER", what was the original plaintext? (Friday) 6) Encrypt "MORNINGX" using the Hill cipher with the encryption key 5 3 9 2 . (UCVMDLLD) 7) Determine the index of coincidence for the following set of letters: 10 As, 25 Bs, 25 Cs, 40 Ds. (19/66) as a fraction in lowest terms. 8) Encrypt "LASTQUESTION" using the playfair cipher and the keyword "LEMONS". ( escprplaytnl)

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Team : ______________ 1) Using an affine cipher with the encryption keys a = 9, b = 5, encrypt the plaintext
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Unformatted text preview: "KNIGHTS" Team : ______________ 2) If the encryption keys for the affine cipher are a = 9 and b = 5, what are the corresponding decryption keys? Team : ______________ 3) Consider using the affine cipher on an alphabet of size 20. How many possible keys would there be? Team : ______________ 4) Find 36-1 mod 79. Team : ______________ 5) The ciphertext for a Vigenere cipher is "HZXKEP". If the encryption keyword is "CIPHER", what was the original plaintext? Team : ______________ 6) Encrypt "MORNINGX" using the Hill cipher with the encryption key 5 3 9 2 . Team : ______________ 7) Determine the index of coincidence for the following set of letters: 10 As, 25 Bs, 25 Cs, 40 Ds. as a fraction in lowest terms. Team : ______________ 8) Encrypt "LASTQUESTION" using the playfair cipher and the keyword "LEMONS"....
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## This note was uploaded on 07/13/2011 for the course CIS 3362 taught by Professor Staff during the Fall '08 term at University of Central Florida.

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Exam1RevQs - "KNIGHTS" Team : ______________ 2)...

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