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A scheme where the same key both locks and unlocks the data is called:

ASynthetic
BSympathetic
CSymmetric
DSystematic
Answer & Solution
Correct answer: C. Symmetric
1. Only one key exists in the whole exchange. 2. It performs the encryption and the decryption alike. 3. That scheme is symmetric encryption. _Source: OpenStax Foundations of Information Systems, Chapter 5, Information Systems Security Risk Management._
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