Message Authentication Codes for the Network Time Protocol
draft-aanchal4-ntp-mac-03

Document Type Expired Internet-Draft (ntp WG)
Last updated 2017-04-29 (latest revision 2016-10-26)
Stream IETF
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-aanchal4-ntp-mac-03.txt

Abstract

The Network Time Protocol (NTP) RFC 5905 [RFC5905] uses a message authentication code (MAC) to cryptographically authenticate its UDP packets. Currently, NTP packets are authenticated by appending a 128-bit key to the NTP data, and hashing the result with MD5 to obtain a 128-bit tag. However, as discussed in [BCK] and [RFC6151], this is not a secure MAC. As such, this draft considers different secure MAC algorithms for use with NTP, evaluates their performance, and recommends the use of CMAC-AES [RFC4493]. We also suggest deprecating the use of MD5 as defined in [RFC5905] for authenticating NTP packets.

Authors

Aanchal Malhotra (aanchal4@bu.edu)
Sharon Goldberg (goldbe@cs.bu.edu)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)