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This draft is a work item of the Network Time Protocol Working Group of the IETF.
Title : Network Time Protocol Version 4 Autokey Specification
Author(s) : B. Haberman, D. Mills
Filename : draft-ietf-ntp-autokey-02.txt
Pages : 52
Date : 2008-4-22
This memo describes the Autokey security model for authenticating
servers to clients using the Network Time Protocol (NTP) and public
key cryptography. Its design is based on the premise that IPSEC
schemes cannot be adopted intact, since that would preclude stateless
servers and severely compromise timekeeping accuracy. In addition,
PKI schemes presume authenticated time values are always available to
enforce certificate lifetimes; however, cryptographically verified
timestamps require interaction between the timekeeping and
authentication functions.
This memo includes the Autokey requirements analysis, design
principles and protocol specification. A detailed description of the
protocol states, events and transition functions is included. A
prototype of the Autokey design based on this memo has been
implemented, tested and documented in the NTP Version 4 (NTPv4)
software distribution for Unix, Windows and VMS at
http://www.ntp.org.
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