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CRYPTOPERIOD

Cryptoperiod

Time during which a specific cryptographic key is authorized for use

A cryptoperiod is the time span during which a specific cryptographic key is authorized for use. NIST's guidelines typically recommend a long-term cryptoperiod

Cryptoperiod

Topics referred to by the same term

relations to quantum physics U.S. code for a cryptographic key change; see cryptoperiod ⟨hj⟩, a two-letter combination used in some languages hj-reduction in

DRYAD

US paper cryptographic system

A single sheet is valid for a limited time (e.g. 6 hours), called a cryptoperiod. A DRYAD cipher sheet contains 25 lines or rows of scrambled letters

DRYAD

NSA encryption systems

Aspect of US National Security Agency

lists that described the rotor arrangements, to be changed each day (the cryptoperiod) at midnight, GMT. The highest level traffic was sent using one-time

NSA encryption systems

NSA_encryption_systems

Glossary of cryptographic keys

Expired key - Key that was issued for a use in a limited time frame (cryptoperiod in NSA parlance) which has passed and, hence, the key is no longer valid

Glossary of cryptographic keys

Glossary_of_cryptographic_keys

FASCINATOR

Type 1 encryption module series

KYK-13 fill devices and a special adaptor box and cable. The standard cryptoperiod was 7 days, i.e. keys had to be changed weekly. FASCINATOR was adopted

FASCINATOR

NESTOR (encryption)

Family of wideband secure voice systems

desirability of fielding cryptographic equipment that was not classified. NSA cryptoperiod doctrine called for keys to be changed every 24 hours. Initially, these

NESTOR (encryption)

NESTOR_(encryption)

Fialka

Soviet cipher machine

broadcast messages. As its name implies, the day key is valid (has a cryptoperiod in NSA parlance) for 24 hours and was changed at 00:01 hours. For the

Fialka