challenge and countersign [password]

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countersign — A secret challenge and its reply. See also challenge; password … Military dictionary
Countersign (military) — In military terminology, a countersign is a sign, word, or any other signal previously agreed upon and required to be exchanged between a sentry or guard and anybody approaching his or her post. The term usually encompasses both the sign given by … Wikipedia
List of shibboleths — Below are listed various examples of shibboleths. Note that many apocryphal shibboleths exist, and that since, by definition, shibboleths rely on stereotypical pronunciation traits, they may not accurately describe the speech of all members of… … Wikipedia
coun|ter|sign — «KOWN tuhr SYN», noun, verb. –n. 1. a) a sign or signal used in reply to another sign. b) Military. a password given in answer to the challenge of a sentinel: »The soldier had to give the countersign before he could pass the sentry. SYNONYM(S):… … Useful english dictionary

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