Lambert M. SurhoneISBN: 978-6-1325-0122-6;
A cryptoperiod is the time span during which a specific cryptographic key is authorized for use. Common government guidelines range from 1 to 3 years for asymmetric cryptography, and 1 day to 7 days for symmetric cipher traffic keys. Factors to consider include the strength of the underlying encryption algorithm, key length, the likelihood of compromise through a security breach and the availability of mechanims of revoking keys. In traditional cryptographic practice, keys were changed at regular intervals, typically at the same time each day.
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