@TechReport{Dartmouth:TR91-154,
  author = {Matt Bishop},
  title = {{A Security Analysis of Version 2 of the Network Time Protocol NTP: A Report to the Privacy and Security Research Group}},
  institution = {Dartmouth College, Computer Science},
  address = {Hanover, NH},
  number = {PCS-TR91-154},
  year = {1991},
  URL = {http://www.cs.dartmouth.edu/reports/TR91-154.pdf},
  abstract = {
    	The Network Time Protocol is being used throughout the
    Internet to provide an accurate time service.  This paper examines the
    security requirements of such a service, analyzes version 2 of the NTP
    protocol to determine how well it meets these requirements, and
    suggests improvements where appropriate.
  }
}