"Our TLBleed exploit successfully leaks a 256-bit EdDSA key from libgcrypt (used in e.g. GPG) with a
98% success rate after just a single observation of signing operation on a co-resident hyperthread and just 17 seconds of analysis time."
https://www.blackhat.com/us-18/briefings.html#tlbleed-when-protecting-your-cpu-caches-is-not-enough
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