ii Use a Hill Cipher t o encipher the message We live in an insecure world Use

Ii use a hill cipher t o encipher the message we live

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ii) Use a Hill Cipher to encipher the message “We live in an insecure world”. Use the following key ”DFCH ”. ANS: KEY= 3 2 5 7 MESSAGE “WE LIVE IN AN INSECURE WORLD” = 22 11 21 08 00 08 18 02 17 22 17 03 04 08 04 13 13 13 04 20 04 14 11 00 ENCIPHER MESSAGE IS = 3 2 22 11 21 08 00 08 18 02 17 22 17 03 5 7 04 08 04 13 13 13 04 20 04 14 11 00 =WLXHTDWBANWBKOUUHJQAVGJP b) i) Write short note on : 1) Blowfish ANS:
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2)RC-5 in the key. ii) What is birthday attack? How a birthday attack can be launched? Illustrate with the help of one example.
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3. Attempt any two parts of the following:- [2X10=20] a) i)What is the difference between weak and strong collision resistance?
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