sdwdate - Secure Distributed Web Date - Homepage
Time keeping is crucial for security, privacy, and anonymity. Sdwdate is a Tor friendly replacement for rdate and ntpdate that sets the system's clock by communicating via onion end-to-end encrypted TCP with Tor onion webservers. Time providers are exclusively reputable sources (whistle-blowing and privacy friendly onion sites) that are highly likely to be hosted on different hardware.
At randomized intervals, sdwdate connects to a variety of webservers and extracts the time stamps from http headers (RFC 2616).
Comparison of sdwdate and ntp
|written in memory-save language||Yes||No|
|secure connection by default (authentication and encryption)||Yes||No|
|gradual clock adjustments||Yes||Yes|
|works over Tor||Yes||No |
|does not require Tor||No||Yes|
|client, time fetcher||Yes||Yes|
|server, time provider||No, not yet||Yes|
|drop in config folder||Yes||No|
|proxy support||Yes||No  |
|can be secured by default on linux distribution level||Yes||No |
|optional gui||Yes, sdwdate-gui (a systray icon)||No|
- server, time provider
- sdwdate issue tracker:
- Requires UDP which is unsupported by Tor, see Tor#UDP.
- NTP security vulnerability because not using authentication by default
- See Dev/TimeSync#NTP.
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