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CISSP study material · question 241 of 500

A signing key pair is issued. Which two statements about the cryptoperiods of the two halves match NIST SP 800-57 Part 1? Choose two.

  1. The key that processes protected information has a recipient-usage period that normally runs on longer.
  2. The recipient-usage period must end before the originator-usage period.
  3. Both halves share a single cryptoperiod, since they are generated together.
  4. The key that applies protection has an originator-usage period.
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Answer: D. The key that applies protection has an originator-usage period.
A. The key that processes protected information has a recipient-usage period that normally runs on longer.

Each half has its own cryptoperiod: the originator-usage period for the key applying protection, the recipient-usage period for the key processing it, running on longer.

Source: NIST SP 800-57 Part 1 Rev. 5 (NIST) — SP 800-57 Part 1 Rev. 5 > 5.3.4 Asymmetric Key Usage Periods and Cryptoperiods

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