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 * Overview
 * Expand: Network Time Protocol Network Time Protocol
    * User Guide

 * Network Time Security
 * Expand: Roughtime Roughtime
    * Get the Roughtime
    * Use Roughtime
    * Server Deprecation

 * Terms of use




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 1. Products
 2. Time Services
 3. Roughtime


ROUGHTIME

RoughtimeExternal link icon Open external link is a simple, flexible, and secure
authenticated time protocol developed by Google.


BACKGROUND

Endpoints on the Internet often synchronize their clocks using the Network Time
Protocol (NTP). NTP provides precise synchronization, but is frequently deployed
without a means of authentication. This is due to a combination of
issuesExternal link icon Open external link .

As a result, a man-in-the-middle attacker can easily influence a victim’s clock.
By moving them back in time, the attacker can, for example, force a victim to
accept an expired (and possibly compromised) TLS certificate or session ticket.

For many applications, precise network time is not essential. It is sufficient
to have accurate time to mitigate these kinds of attacks, such as within 10
seconds of real time. This observation is the primary motivation behind
Roughtime.


NEXT STEPS

For more technical details on Roughtime, refer to the introductory blog
postExternal link icon Open external link .

To get started, refer to Get the Roughtime. For more practical guidance on using
the Roughtime, refer to our how-to guide.

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Edit on GitHubExternal link icon Open external link   ·   Updated 1 year ago



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