Cryptographic AlarmCreated OnFebruary 15, 2018Last Updated OnFebruary 21, 2018Views6 You are here: KB Home Definitions Definitions C Cryptographic Alarm < BackCircuit or device that detects failures or aberrations in the logic or operation of crypto-equipment. Crypto-alarm may inhibit transmission or may provide a visible and/or audible alarm. SOURCE: CNSSI-4009