(a) Find the linear recursion defining the sequence 0101110 0101110. . . of period 7. (b)...
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(a) Find the linear recursion defining the sequence 0101110 0101110. . . of period 7. (b) Let Ek(m); Dk(c) be a block cipher. The special mode of this block cipher encrypts a sequence of message blocks m; m2; : : : ; by the sequence of ciphertext blocks c1; C2; : : : using the following method: C = m i-1 xor Ek(mixor c i-1); i 1, mo and co are fixed (public) initialization vectors. C i. Describe how decryption is performed. ii. Suppose ciphertext block c; is damaged in transit. Which plaintext blocks become undecipherable as a result? Explain. (c) We use the affine cipher for encryption and decryption. However, we would like to be able to distinguish between uppercase and lowercase characters, so that we have a cleartext or plaintext and ciphertext space of size 52. How large is the key space of the affine cipher in this case? (a) Find the linear recursion defining the sequence 0101110 0101110. . . of period 7. (b) Let Ek(m); Dk(c) be a block cipher. The special mode of this block cipher encrypts a sequence of message blocks m; m2; : : : ; by the sequence of ciphertext blocks c1; C2; : : : using the following method: C = m i-1 xor Ek(mixor c i-1); i 1, mo and co are fixed (public) initialization vectors. C i. Describe how decryption is performed. ii. Suppose ciphertext block c; is damaged in transit. Which plaintext blocks become undecipherable as a result? Explain. (c) We use the affine cipher for encryption and decryption. However, we would like to be able to distinguish between uppercase and lowercase characters, so that we have a cleartext or plaintext and ciphertext space of size 52. How large is the key space of the affine cipher in this case?
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a The linear recursion defining the sequence 0101110 0101110 of period 7 is an an3 a... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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