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A unique piece of information that is used in encryption.

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A unique piece of information that is used in encryption.

(a) Cipher

(b) Plain Text

(c) Key

(d) Cipher

This question was addressed to me at a job interview.

This interesting question is from Encryption and Viruses in division Information Technology of Computer Fundamentals

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Correct choice is (c) Key

To explain I would say: The key is the unique piece of information.  It is used to create the cipher text and decrypt it back.

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