Warm-Start Command

Introduction/Additional information: 

This ASM implements the Project 25 OTAR Warm Start Command message.

Usage Notes

  • This message is sent from the Key Management Facility to the Mobile Radio to provide TEKS when the MR has a valid KEK but no TEKs.
  • Complying with NIST requirements for a separate (non-derived) key for computing the MAC is impossible, as the Project 25 standard calculates the MAC of a Warm Start Message using a key derived from the received TEK.
  • This message is broadcast as a non-addressed message, with repeat disabled, to reduce the message size, and to avoid issues from a relocated RSI to a different MMSI.

Version 0:

This is an RTCM compliant implementation of the Project 25 OTAR Warm Start Command Message.

This ASM only has an AIS Message 26 variant.

Permitted as from: 
12/05/2016
Registrant: 
USCG
Message number: 
26
DAC: 
366
FI: 
28
Version: 
0
State: 
in force
Number of slots (max): 
3
Last modified: 
20210129T231915