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Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.
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Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.

A.
Key Schedule
Answers
A.
Key Schedule
B.
Key Clustering
Answers
B.
Key Clustering
C.
Key Space
Answers
C.
Key Space
D.
Key Exchange
Answers
D.
Key Exchange
Suggested answer: C

Explanation:

Key Space

https://en.wikipedia.org/wiki/Key_space_(cryptography)

Algorithm's key space refers to the set of all possible permutations of a key.

To prevent an adversary from using a brute-force attack to find the key used to encrypt a message, the key space is usually designed to be large enough to make such a search infeasible. On average, half the key space must be searched to find the solution.

Another desirable attribute is that the key must be selected truly randomly from all possible key permutations. Should this not be the case, and the attacker is able to determine some factor that may influence how the key was selected, the search space (and hence also the search time) can be significantly reduced. Humans do not select passwords randomly, therefore attackers frequently try a dictionary attack before a brute force attack, as this approach can often produce the correct answer in far less time than a systematic brute force search of all possible character combinations.

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asked 18/09/2024
Thuy Nguyen
32 questions
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