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Amount of information to work with

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Reference no: EM132430989

Problem 1

a. The                         attack is the easiest to defend against because the opponent has the least amount of information to work with:

A. Ciphertext-only

B. Chosen ciphertext

C. Known plaintext

D. Chosenplaintext

b. We know that encryption provides confidentiality. Does it provide privacy? (Explain)

d. What is the size (in bits) of CBC-MAC, when used with DES encryption?

f. List all the element of the setZpfor p=11. Does every element of Zp have an inverse? Why/why not? For those that do, 5 and 7 ('cause they are relatively prime with 11) give the inverse for each.

g. In the RSA public-key encryption scheme, each user has a public key, e, and a private key, d. Suppose Bob leaks his private key. Rather than generating a new modulus, he decides to generate a new public key and a new private key. Is this safe? Explain the ramifications.

Reference no: EM132430989

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