| (I) The time span during which a particular key is authorized to
be used in a cryptographic system. (See: key management.)
(C) A cryptoperiod is usually stated in terms of calendar or clock
time, but sometimes is stated in terms of the maximum amount of
data permitted to be processed by a cryptographic algorithm using
the key. Specifying a cryptoperiod involves a tradeoff between the
cost of rekeying and the risk of successful cryptanalysis.
(C) Although we deprecate its prefix, this term is long-
established in COMPUSEC usage. (See: crypto) In the context of
certificates and public keys, "key lifetime" and "validity period"
are often used instead.
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