Cryptography and Network Security

Limited characteristics make it impossible for hash functions to be used to determine whether or not data has changed.

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

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

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

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

the most widely used hash function has been the Whirlpool.

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.

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".

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 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 ___________ .

Whirlpool is a popular cryptographic hash function.

the principal object of a hash function is __________ .

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.

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

Hash functions can be used for intrusion and virus detections.

the cryptographic hash function is not a versatile cryptographic algorithm.

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

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

A ___________ accepts a variable length block of data as input and produces a fixed size hash value h = H(M).

Encryption hardware is optimized toward smaller data sizes.