challenge

data item chosen at random and sent by the verifier to the claimant, which is used by the claimant, in conjunction with secret information held by the claimant, to generate a response which is sent to the verifier
EXAMPLE: In ISO 24534-4 the term challenge is also used in case an ERT does not have enabled encryption capabilities and the challenge is merely copied without any secret information applied.

Application Area: Automatic Vehicle and Equipment Identification (AVI/AEI)