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A New Internet-Draft is available from the on-line Internet-Drafts directories.
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
Author(s) : D. Mills
Filename : draft-ietf-stime-ntpauth-03.txt
Pages : 38
Date : 07-Feb-02
This memorandum describes a scheme for authenticating servers to clients
using the Network Time Protocol. It extends prior schemes based on
symmetric key cryptography to a new scheme based on public key
cryptography. The new scheme, called Autokey, is based on the premiss
that the IPSEC schemes proposed by the IETF cannot be adopted intact,
since that would preclude stateless servers and severely compromise
timekeeping accuracy. In addition, the IPSEC model presumes
authenticated timestamps are always available; however,
cryptographically verified timestamps require interaction between the
timekeeping function and authentication function in ways not yet
considered in the IPSEC model.
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