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Previously intercepted communications must remain secure even if a current encryption key is compromised in the future. Which of the following best supports this requirement?
Correct Answer: C
Forward secrecy (FS) ensures that past encrypted data remains secure even if encryption keys are compromised in the future. It generates ephemeral session keys that are not reused. Other options: A (Tokenization) replaces sensitive data with tokens but does not prevent key compromise. B (Key stretching) makes brute-force attacks harder but does not ensure secrecy after compromise. D (Simultaneous Authentication of Equals - SAE) is used in WPA3 but is not related to past communication security.