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Does anyone know how trustworthy client time accuracies are accounting for clock skews? After a bunch of google searches, I have not found anything suggesting
by mrep 9y ago
Does anyone know how trustworthy client time accuracies are accounting for clock skews?
After a bunch of google searches, I have not found anything suggesting how accurate clocks are for clients besides Charlies algorithm [0] (I want to know UTC time/epoch... whatever from each client so i can compare them) which I am concerned about adopting due to the wiki page assuming a high quality network.
[0]: https://en.wikipedia.org/wiki/Cristian%27s_algorithm https://en.wikipedia.org/wiki/Cristian%27s_algorithm
- chrismorgan 9y agoThese timing attacks are all about local time deltas, not absolute times, because it’s measuring the CPU caches, not anything to do with the network. Things like “this operation took 5µs, which suggests that the data it was accessing was/was not cached”.