Exam 11: Cryptographic Hash Functions

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

The Secure Hash Algorithm design closely models,and is based on,the hash function __________ .

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

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.

Whirlpool is a popular cryptographic hash function.

The principal object of a hash function is __________ .

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.

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

The cryptographic hash function is not a versatile cryptographic algorithm.

A ___________ is an algorithm for which it is computationally infeasible to find either a)a data object that maps to a pre-specified hash result or b)two data objects that map to the same hash result.

The SHA-512 algorithm has the property that every bit of the hash code is a function of every bit of the input.

It can be shown that some form of birthday attack will succeed against any hash scheme involving the use of cipher block chaining without a secret key,provided that either the resulting hash code is small enough or that a larger hash code can be decomposed into independent subcodes.

The cryptographic hash function requirement that guarantees that it is impossible to find an alternative message with the same hash value as a given message and prevents forgery when an encrypted hash code is used is the ___________ .

Hash functions are commonly used to create a one-way password file.

The hash value of a message in the __________ application is encrypted with a user's private key.

The compression function used in secure hash algorithms falls into one of two categories: a function specifically designed for the hash function or an algorithm based on a ___________ .

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.

Encryption hardware is optimized toward smaller data sizes.

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

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