1. Encrypt and decrypt the plaintext cipher using the Hill cipher for the key value 2. Break the following cipher. The plaintext is taken from a popular computer textbook, so ‘computer’ is a probable...

1. Encrypt and decrypt the plaintext cipher using the Hill cipher for the key value

2. Break the following cipher. The plaintext is taken from a popular computer textbook, so ‘computer’ is a probable word. The plaintext consists entirely of letters (no spaces). The cipher text is broken up into blocks of five characters, for readability.

aauan cvlre rurnn dltme aeepb ytust

iceat npmey iicgo gorch srsoc

nntii imiha oofpa gsivt tpsit lbolr otoex.

3. Construct a LFSR corresponding to the input sequence S1S2S3S4 = 1001.