NTS: Authenticated Time at Meta
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Meta has launched an authenticated Network Time Security (NTS, RFC 8915) service at nts.meta.com, adding cryptographic verification to time synchronization that legacy NTP has lacked since 1985. The servers are stateless, with cookie keys derived rather than stored or replicated, and Meta has open-sourced the protocol, server and client through its Time library on GitHub while urging Android and iOS NTP client maintainers to enable NTS. The move builds on Meta's earlier migration from ntpd to chrony, which improved accuracy from 10 milliseconds to 100 microseconds, shifting the service from merely precise to verifiable. Meta argues time is uniquely load-bearing because certificate validity windows, token expiry, replay protection and log ordering are all measured against the local clock, and the check is circular since X.509 notBefore/notAfter validation itself requires trusted time. Watch for NTS adoption among mobile OS vendors and whether shrinking certificate lifetimes force broader authenticated-time deployment across the industry.
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Named in this story
Meta (META), NTS, NTP, chrony, ntpd
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