Which term defines the time-based validity of a cryptographic key?

• A. Cryptographic Key
• B. Cryptoperiod
• C. Data-Flow Diagram
• D. Database

Answer: (B)

Time-based validity of a cryptographic key is defined by the cryptoperiod. It is the span from when a key is generated and activated to when it is retired or destroyed, during which the key should be used for encryption and decryption. Managing the cryptoperiod helps limit risk: if a key is compromised, only data within its cryptoperiod is affected, and regular rotation or timely destruction reduces long-term exposure. Factors like key length, algorithm, and data sensitivity influence how long a key should remain in use, but the essential term for the time window itself is cryptoperiod. The other terms describe different things: a cryptographic key is the secret used for protection, a data-flow diagram shows how data moves through a system, and a database is a store of data.