Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Challenge and reply authentication is a
|| [p]rearranged procedure in which a subject requests authentication of another and the latter establishes validity with a correct reply.
- National Information Systems Security (INFOSEC) Glossary (NSTISSI No. 4009 Sept. 2000).