Message Authentication Code for the Network Time Protocol, June 2019
- File formats:
- PROPOSED STANDARD
- RFC 5905
- A. Malhotra
- ntp (int)
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The Network Time Protocol (NTP), as described in RFC 5905, states that NTP packets should be authenticated by appending NTP data to a 128-bit key and hashing the result with MD5 to obtain a 128-bit tag. This document deprecates MD5-based authentication, which is considered too weak, and recommends the use of AES-CMAC as described in RFC 4493 as a replacement.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.