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Question 67 - 212-81 discussion

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John works as a cryptography consultant. He finds that people often misunderstand the reality of breaking a cipher. What is the definition of breaking a cipher?

A.
Finding any method that is more efficient than brute force
Answers
A.
Finding any method that is more efficient than brute force
B.
Uncovering the algorithm used
Answers
B.
Uncovering the algorithm used
C.
Rendering the cypher no longer useable
Answers
C.
Rendering the cypher no longer useable
D.
Decoding the key
Answers
D.
Decoding the key
Suggested answer: A

Explanation:

Finding any method that is more efficient than brute force.

https://en.wikipedia.org/wiki/Cryptanalysis

Bruce Schneier notes that even computationally impractical attacks can be considered breaks: 'Breaking a cipher simply means finding a weakness in the cipher that can be exploited with a complexity less than brute force. Never mind that brute-force might require 2^128 encryptions; an attack requiring 2^110 encryptions would be considered a break...simply put, a break can just be a certificational weakness: evidence that the cipher does not perform as advertised.'

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asked 18/09/2024
Hector Moreno
40 questions
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