%% You should probably cite draft-ietf-ntp-nts-for-ptp instead of this I-D.
@techreport{langer-ntp-nts-for-ptp-00,
    number =    {draft-langer-ntp-nts-for-ptp-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-langer-ntp-nts-for-ptp/00/},
    author =    {Martin Langer and Rainer Bermbach},
    title =     {{NTS4PTP - Key Management System for the Precision Time Protocol Based on the Network Time Security Protocol}},
    pagetotal = 36,
    year =      2021,
    month =     feb,
    day =       22,
    abstract =  {This document defines a key management service for automatic key management for the integrated security mechanism (Prong A) of IEEE Std 1588{[}TM{]}-2019 described there in Annex P. It implements a key management for immediate security processing complementing the exemplary GDOI proposal in P.2.1.2.1. The key management service is based on the "NTS Key Establishment" protocol defined in IETF RFC 8915 for securing NTP, but works completely independent from NTP.},
}