NewsSchneier on Security

Claude Fable Solves a Historical Cipher

Claude Fable 5.1 solved a 370-year-old cipher in forty-four minutes. This tracks with what I wrote about AIs doing mathematics: It’s good at things that involve lots of searching and testing. EDITED TO ADD (9/14): I’m not sure if this result is correct . The blog comments have more discussion.

Other advisories

Not ratedosv:CLEANSTART-2026-SG18333Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-RH90133Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-OU55359Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-QT07597Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-NH23437Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-ZJ27938Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-OF75391Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Not ratedosv:CLEANSTART-2026-YK22959Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing

Other news entries

Source: https://www.schneier.com/blog/archives/2026/09/claude-fable-solves-a-historical-cipher.html

More on Historical

Other advisories

Other news entries