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Security of public NTP servers: 1 (5515579062000) There are Servers and Servers..... UTC labs making their timescale avaliable to the public such as NIST, USNO, PTB, SP, NPL...... Organizations that have their own time for all their internal activities that do not need to be syncronized/tracable to UTC(k) Many other applications How do we know we are getting the time we expect? I will querry NIST as the government I trust: DNS Already overloaded semantics of an IP address How do you knew your packets actutaly reaches NIST? Man in the middle attack |