Question: Q.2 There are 5 linear feedback shift registers (FLSR) that are defined as follows f(x)= x +x+1 f(x)=x* +x+1 f(x)= x + x +1 f(x)=

Q.2 There are 5 linear feedback shift registers (FLSR) that are

Q.2 There are 5 linear feedback shift registers (FLSR) that are defined as follows f(x)= x +x+1 f(x)=x* +x+1 f(x)= x + x +1 f(x)= x +x+1 f(x)= x'+x+1 (a) It is desired to design a stream cipher with a key length of 15 bits. What are the possible LFSRs that can be combined to meet this requirement? (5 marks) (b) Two designs of A and B are obtained by combining 3 rd, 5 th and 7 th order LFSRS, and 6 th and 7 th order LFSRs respectively. The resulting keystreams obtained are as follows Design A - 10000 10001100101011111001011 Design B - 1010110 0101001 11100100001101 Select either one of the two designs that meets the confusion criteria of a cipher system. (10 marks)

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