Q. The main difference in MACs and digital signatures is that, in digital signatures the hash value of the message is encrypted with a user’s public key.

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Q. What is a one-way password file?

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Q. Which one of the following is not an application hash functions?

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Q. If the compression function is collision resistant, then so is the resultant iterated hash function.

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Q. A larger hash code cannot be decomposed into independent subcodes.

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Q. We define collision as: A collision occurs if we have x=y and H(x) = H(y).

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Q. Consider the following properties:

Variable Input size
Fixed Output size
Efficiency
Pre image resistant
Second Pre image Resistant
Collision resistant
Pseudo randomness

A has function that satisfies the first _______ properties in the above table is referred to as a weak hash function.

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Q. A function that is second pre-image resistant is also collision resistant.

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Q. Which attack requires the least effort/computations?

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Q. SHA-1 produces a hash value of

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Q. What is the number of round computation steps in the SHA-256 algorithm?

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Q. In SHA-512, the message is divided into blocks of size ___ bits for the hash computation.

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Q. What is the maximum length of the message (in bits) that can be taken by SHA-512?

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Q. The message in SHA-512 is padded so that it’s length is

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Q. The big-endian format is one in which

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Q. In SHA-512, the registers ‘a’ to ‘h’ are obtained by taking the first 64 bits of the fractional parts of the cube roots of the first 8 prime numbers.

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Q. What is the size of W (in bits) in the SHA-512 processing of a single 1024- bit block?

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Q. In the SHA-512 processing of a single 1024- bit block, the round constants are obtained

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Q. The output of the N 1024-bit blocks from the Nth stage is

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Q. Among the registers ‘a’ to ‘h’ how many involve permutation in each round?

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