Comment by duskwuff
1 day ago
> TLS 1.0’s CBC chaining made IVs predictable and enabled the BEAST attack. That’s a documented protocol weakness, allegedly put in there by US state actors on purpose.
This is errant nonsense. At the time SSL/TLS were designed, using CBC with block ciphers was generally considered best practice - it was not at all an unusual choice.
Using CBC is fine. TLS and (prior to that) IPSEC set the CBC IV of messages to the last ciphertext block of the previous message --- pretending as if they were encrypting one long stream, rather than discrete messages. That's never been OK, and cryptographers warned about it at the time.
Arrant nonsense, surely?
Don't know what's so sure about it, either is perfectly valid.