When a client asks for the time, it sends a random nonce. The server replies with a signed certificate containing both the nonce and a timestamp, proving the response happened after the request. Responses can be chained together with provable ordering; if any server’s timestamps are inconsistent with that ordering, that server is cryptographically “outed” as unreliable.
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Luckily, Liang’s thesis also contains efficient algorithms to work
The drone attack on the US embassy in Riyadh caused a minor fire, prompting the diplomatic mission to tell Americans to distance themselves from the compound. The attack followed an earlier Iranian drone strike on the US embassy in Kuwait, as Iran continued to target US bases, facilities and personnel in Arab Gulf states.