CISSP: Certified Information Systems Security Professional

Question

Using the ciphertext and resulting cleartext message to derive a monoalphabetic cipher key is an example of which cryptanalytic attack method?

Explanation

A known-plaintext attack relies on corresponding ciphertext and plaintext values to derive information about the encryption key. For a monoalphabetic substitution cipher, matching each ciphertext character with its known cleartext character reveals the substitution mapping.

CISSP: Certified Information Systems Security Professional

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QuestionQ193

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