Network Time Protocol: autokey Version 2 Specification

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Last updated 2013-08-28 (latest revision 2013-02-24)
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This document describes a security protocol that enables authenticated time synchronization using Network Time Protocol (NTP). Autokey Version 2 obsoletes NTP autokey protocol RFC 5906 [RFC5906] which suffers from various security vulnerabilities. Its design considers the special requirements that are related to the task of precise timekeeping.


Dieter Sibold (
Stephen Roettger (

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