Hey! I'm David, cofounder of zkSecurity and the author of the Real-World Cryptography book. I was previously a crypto architect at O(1) Labs (working on the Mina cryptocurrency), before that I was the security lead for Diem (formerly Libra) at Novi (Facebook), and a security consultant for the Cryptography Services of NCC Group. This is my blog about cryptography and security and other related topics that I find interesting.
Taken from the SLOTH paper, the current estimated complexities of the best known attacks against MD5 and SHA-1:
| Common-prefix collision | Chosen-prefix collision | |
| MD5 | 2^16 | 2^39 |
| SHA-1 | 2^61 | 2^77 |
| MD5|SHA-1 | 2^67 | 2^77 |
MD5|SHA-1 is a concatenation of the outputs of both hashes on the same input. It is a technique aimed at reducing the efficiency of these attacks, but as you can see it, it is not that efficient.
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