It was incorrect to end this year with post like my previous
So Happy New Year to everyone!
However, can’t leave post without any information related to blog’s tagline. So just some information I’ve found interesting in last days.
1. I’ve got question recently about AVX extension for upcoming CPUs, checked latest docs available and suddenly found that (quote) “VI: “Vector Integer” instructions are not promoted to 256-bit” applied to every instruction needed for MD4/MD5/SHA1 hashes. This means AVX will be as useless as SSE was for password cracking as vector size increased from 128 to 256 bit only for floating point values. Simply ridiculous.
2. Somehow I’ve read disassembly of Cayman’s ISA like it capable of doing 32-bit integer multiplications with each of XYZW units. Actually I was wrong and in reality all 4 these units required now to perform one 32-bit multiplication. So with previous architecture it was possible to perform 4x additions/logic/bit-aligns AND multiplication and now multiplication requires 4x more instructions. Not very good for classic ZIP encryption…
3. …which currently not supported for ATI GPUs at all because they missing some functionality presents in NVIDIA GPUs. So right now AccentZPR (v2.0 final released recently) shows millions of passwords per second for NVIDIA GPUs and ZERO for ATI ones. Good counterexample for “Oh, ATI’s GPUs are so good and fast and cheap”…
4. For SHA-1 with fixed charset (let’s say 10 symbols) and fixed password length (like 15 + 9 byte salt) it’s possible to optimize algorithm a lot. I’ve got 800M/s speed compared with ighashgpu v0.80′s 680M/s at single 5770.
More information will come next year, so stay tuned!