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Quiz EC-COUNCIL - 212-81 - Certified Encryption Specialist Updated Test Duration

NEW QUESTION 25
Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.

A. Key Schedule
B. Key Clustering
C. Key Space
D. Key Exchange

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.

NEW QUESTION 26
Which one of the following are characteristics of a hash function? (Choose two)

A. Requires a key
B. Fast
C. One-way
D. Fixed length output
E. Symmetric

Answer: C,D
Explanation:
Correct answers: One-way, Fixed length output
https://en.wikipedia.org/wiki/Cryptographic_hash_function
A cryptographic hash function is a mathematical algorithm that maps data of arbitrary size (often called the "message") to a bit array of a fixed size (the "hash value", "hash", or "message digest"). It is a one-way function, that is, a function which is practically infeasible to invert.
Incorrect answers:
Symmetric. Cryptographic algorithms can be categorized into three classes: Hash functions, Symmetric and Asymmetric algorithms. Differences: purpose and main fields of application.
Requires a key. Well, technically, this is the correct answer. But in the hash-function, "key" is input data.
Fast. Fast or slow is a subjective characteristic, there are many different algorithms, and here it is impossible to say this unambiguously like "Symmetric encryption is generally faster than asymmetric encryption."

NEW QUESTION 27
Which of the following techniques is used (other than brute force) to attempt to derive a key?

A. Hacking
B. Cryptography
C. Password cracking
D. Cryptoanalysis

Answer: D
Explanation:
Cryptoanalysis
https://en.wikipedia.org/wiki/Cryptanalysis
Cryptanalysis is the study of analyzing information systems in order to study the hidden aspects of the systems. Cryptanalysis is used to breach cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown.

NEW QUESTION 28
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