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.
Given all that complexity, along with the fact that I’m using a high-level dynamic programming language, I wasn’t surprised when my initial benchmarks showed the server responding in 200 microseconds (µs).
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introduce new primitives in the typing module;
currentUser.set(SecurityContextHolder.getContext().getAuthentication().getName());