Date: Fri, 16 May 2008 18:24:51 +0100 From: "Craig Edwards (Brain)" <brain@...tspike.net> To: oss-security@...ts.openwall.com Subject: Re: OpenSSH key blacklisting Hi, I havent been following this debacle too closely as i dont have much to do with debian, however, wouldnt such a system be vulnerable to false positives if you are just going to hash partial fingerprints rather than whole fingerprints? -- Brain Solar Designer wrote: > Hi, > > Are any other distros, besides Debian, Ubuntu, and derived ones, going > to implement key blacklisting in OpenSSH - or are considering it? > > We are considering it for Openwall GNU/*/Linux, and if our effort would > be reused by others, or if others join us in developing and/or testing > the patch, this would be a reason for us to go for it. > > I don't think we'll take the Debian/Ubuntu patch as-is. Rather, we are > likely to use a trivial binary encoding/compression method for the > partial fingerprints. We'd also use smaller partial fingerprints. With > the approach I have in mind, it'd take around 4.55 bytes per key to > store 48-bit partial fingerprints, bringing the installed file size for > 3 arch types and 2 key types/sizes in under 1 MB (or just over 1 MB for > 3 key types/sizes). > > Please comment. > > Thanks, > > Alexander >
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