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How many other messages expected to generate same hash value

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Reference no: EM1372298

1. Using the English alphabet (i.e., mod 26 arithmetic) let plaintext = {p1, p2,... , pn} and corresponding ciphertext = {c1, c2,... , cn}. Suppose the encryption function is ci = pi + 15 (mod 26). If you receive the ciphertext message YPHDCRPBEQTAA, decrypt to recover the plaintext. What is the decryption function, and the recovered plaintext? What type of cipher is this?

2. A 1,048,576-bit message is used to generate a 10-bit hash. One the average, how many other messages could be expected to generate the same hash value?

Reference no: EM1372298

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