Date: Thu, 31 Jan 2013 09:03:00 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: NetNTLMv1 On Thu, Jan 31, 2013 at 07:59:52AM +0400, Solar Designer wrote: > Oh, here's an idea: what if we apply the DES encryption (or decryption) > to the last of the 3 blocks, not the first? Doesn't the last block > contain only like a couple of non-zero bytes? (I don't recall.) If so, > we could replace this instance of DES with a lookup table, computed just > once (e.g. at program startup, to avoid increasing program size). I took a look. It's the last portion of the key, not block, that contains only 2 bytes. The table can't be precomputed just once because it depends on the challenge, but it can be precomputed in salt() (higher memory usage) or set_salt() (lower memory usage, but also lower speed). Alexander
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