212-81 Exam Dumps | A _____ is a function is not reversible.

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Question 9/74

A _____ is a function is not reversible.

A. Stream cipher

B. Asymmetric cipher

C. Hash

D. Block Cipher

Correct Answer: C

Hash
https://en.wikipedia.org/wiki/Hash_function
Hash functions are irreversible. This is actually required for them to fulfill their function of determining whether someone possesses an uncorrupted copy of the hashed data. This brings susceptibility to brute force attacks, which are quite powerful these days, particularly against MD5.

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