Cruel Summer: hybrid signatures, Downfall, Zenbleed, 2G downgrades

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We're back from our summer vacation! We're covering a bunch of stuff we saw and did: Transcript: https://securitycryptographywhatever.com/2023/09/13/cruel-summer/ Links: - Zenbleed: https://lock.cmpxchg8b.com/zenbleed.html - Downfall: https://downfall.page - Post-quantum Yubikeys: https://security.googleblog.com/2023/08/toward-quantum-resilient-security-keys.html "Security Cryptography Whatever" is hosted by Deirdre Connolly (@durumcrustulum), Thomas Ptacek (@tqbf), and David Adrian (@davidcadrian)

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