Memos

The information in this section was originally hosted on the University of Delaware homepage for Professor David L. Mills, PhD. While much of it can be considered historical, it provides an overview of the design principles for NTP and related time synchronization technology.

Memos

Title	Publication Date	Format
Suggestions for Protocol and Security Enhancements for the Network Time Protocol	July 22, 2023	HTML
Interplanetary Internet (IPN)	June 4, 2001	TXT
Public-Key Cryptography for the Network Time Protocol Version 1 (Internet Draft)	April, 2001	TXT
PPS Signal Transfer via Broadcast Television Stations	January 1, 2001	TXT
A Brief History of NTP Time: Confessions of an Internet Timekeeper	August 1, 2000	TXT
Public-Key Cryptography for the Network Time Protocol Version 1 (Internet Draft)	June, 2000	TXT
Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0 (Internet Draft)	August 17, 1999	TXT
Authentication Scheme Extensions to NTP (Internet Draft)	September 1, 1998	TXT
A Kernel Model for Precision Timekeeping	January 31, 1996	PDF
A Kernel Programming Interface for Precision Time Signals	January 31, 1996	PDF
Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation	January 31, 1996	PDF
A Comparison of Certain Timekeeping Systems and the Network Time Protocol	May 19, 1991	PDF