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Exam 11: Cryptographic Hash Functions

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Question 1

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__________ are measures of the number of potential collisions for a given hash value.

A) MACs
B) Primitives
C) Hash codes
D) Preimages

E) A) and B)
F) A) and C)

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Question 2

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Message authentication is achieved using a __________ .

A) DES
B) MDF
C) SHA
D) MAC

E) B) and D)
F) C) and D)

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Question 3

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

SHA-1 produces a hash value of __________ bits.

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

The hash algorithm involves repeated use of a __________ function,f,that takes two inputs an n-bit input and a b-bit block)and produces an n-bit output.

Three new versions of SHA with hash value lengths of 256,384,and 512 bits are collectively known as __________ .

The most important and widely used family of cryptographic hash functions is the __________ family.

A message authentication code is also known as a __________ hash function.

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

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

The evaluation criteria for SHA-3 are security,___________,and algorithm and implementation characteristics.

SHA-1 is very similiar in structure and in the basic mathematical operations used to __________ and SHA-0.

The Secure Hash Algorithm was developed by the ___________ .

The __________ resistant guarantees that it is impossible to find an alternative message with the same hash value as a given message.

Hash functions can be used for intrusion and virus detections.

The kind of hash function needed for security applications is referred to as a __________ hash function.

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

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 ___________ .