I-D ACTION:draft-ietf-stime-ntpauth-04.txt

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This draft is a work item of the Secure Network Time Protocol Working Group of the IETF.

	Title		: Public-Key Cryptography for the Network Time Protocol 
                          Version 2
	Author(s)	: D. Mills
	Filename	: draft-ietf-stime-ntpauth-04.txt
	Pages		: 67
	Date		: 2002-11-5
	
This document 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 premiss 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 function and 
authentication function in ways not yet considered by the IETF. 
                                   
   This Document 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 document 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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