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Turning ciphertext back into plaintext with an algorithm and key is:

ADeflection
BDelegation
CDeclaration
DDecryption
Answer & Solution
Correct answer: D. Decryption
1. Encryption goes one way. 2. The reverse operation has its own name. 3. Decryption is the process of changing ciphertext into plaintext using an algorithm and key. 4. So the answer is decryption. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_
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