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Exam 11: Cryptographic Hash Functions

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Question 21

Multiple Choice

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the Secure Hash Algorithm was developed by the ___________ .

A) ItIL
B) IEEE
C) ISO
D) NISt

E) All of the above
F) None of the above

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Question 22

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It is possible to use a hash function but no encryption for message authentication.

A) True
B) False

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Question 23

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Big-endian format is the most significant byte of a word in the low-address byte position.

Requirements for a cryptographic hash function include ___________ which is the one-way property.

the two categories of attacks on hash functions are __________ attacks and cryptanalysis.

Whirlpool is a popular cryptographic hash function.

Virtually all cryptographic hash functions involve the iterative use of a compression function.

When a hash function is used to provide message authentication, the hash function value is often referred to as a ___________ .

"Given a hash function H, with n possible outputs and a specific value H(x) , if H is applied to k random inputs, what must be the value of k so that the probability that at least one input y satisfies H(y) = H(x) is 0.5" is a reference to the __________ .

A weak hash function is sufficient to protect against an attack in which one party generates a message for another party to sign.

Message authentication is achieved using a __________ .

the cryptographic hash function is not a versatile cryptographic algorithm.

A hash function that satisfies the properties of variable input size, fixed output size, efficiency, preimage resistant, second preimage resistant and __________ is referred to as a strong hash function.

If collision resistance is required the value _________ determines the strength of the hash code against brute-force attacks.

the way to measure the resistance of a hash algorithm to cryptanalysis is to compare its strength to the effort required for a brute-force attack.

Hash functions can be used for intrusion and virus detections.

the principal object of a hash function is __________ .

the effort required for a collision resistant attack is explained by a mathematical result referred to as the ___________ .

An ideal hash algorithm will require a cryptanalytic effort __________ the brute-force effort.

A good hash function has the property that "the results of applying the function to a large set of inputs will produce outputs that are evenly distributed and apparently random".