All of these questions have been addressed already in the thread. I have not seen any. Only messages "it could not be the truth". Ed/ -----Original Message----- From: Saku Ytti <saku@ytti.fi> Sent: Monday, September 8, 2025 21:23 To: Vasilenko Eduard <vasilenko.eduard@huawei.com> Cc: North American Network Operators Group <nanog@lists.nanog.org>; Dan Collins <dcollinsn@gmail.com> Subject: Re: MD5 is slow
On Mon, 8 Sept 2025 at 11:00, Vasilenko Eduard <vasilenko.eduard@huawei.com> wrote:
Your comments on the performance are very important. I still believe that any Hash must be slow enough, because if it were fast, then the attacker could take a big GPU and brute force it (The routing message is very predictable; only the password is not known, but could be tested from the dictionary). But what is slow? us or ms? In support of the latter, look to https://www.ijcna.org/Manuscripts/IJCNA-2020-O-01.pdf. It is hundreds of cycles per byte. Acceleration helps, but not much (around 3x) https://github.com/minio/sha256-simd/blob/master/README.md. A few milliseconds per every hop is expensive.
All of these questions have been addressed already in the thread. I'm not sure what to do here, should we repeat the answers? -- ++ytti