Cryptographer Matthew Green: no imminent cryptanalysis, but frontier labs' questions are telling
matthew_d_green · x · 2026-10-09
Renowned cryptographer Matthew Green posted a thread defusing panic caused by his earlier casual tweet about public-key encryption.
- He urges people not to stop using TLS, post Bitcoin seeds in cleartext, or switch to Telegram as a secure messenger — "Encryption is good, use it."
- He knows of no imminent cryptanalysis results, but says he can infer which frontier labs likely do not have one (or are great actors) from the questions they're asking — though that only covers a subset of labs.
- His real concern: standardized public-key encryption (and some signatures) rests on a small number of hard problems, making single-point breaks catastrophic.
The thread keeps alive the subtle rumor that some AI frontier lab may hold a cryptography breakthrough.
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