Date: Thu, 30 Aug 2018 18:13:34 +0200 From: zugtprgfwprz@...rnkuller.de To: oss-security@...ts.openwall.com Subject: Re: Travis CI MITM RCE Hi Daniel, On 28.08.2018 18:43, Daniel Kahn Gillmor wrote: > In some ways, the keyserver network has done the OpenPGP community a > disservice, by encouraging OpenPGP users to refer to keys by > fingerprints (or even worse, by key IDs). While this is a useful > shorthand in some contexts, it's really a security/reliability > anti-pattern when it comes to secure programming. I agree about the "key ID" part, but not about the "fingerprint" part. Pinning a cryptographic hash over a public key isn't a security antipattern by any strech of the imagination. Sure, you could argue that the SHA-1 used by GPG isn't state-of-the-art anymore, but we're not talking about collision attacks, but second preimage attacks. Far worse for the attacker. The way you phrased it, however, all applications of fingerprints/hashes would be broken (SSH fingerprints, HPKP, etc.), regardless of the hash function they use. Cheers, Joe t -- "A PC without Windows is like a chocolate cake without mustard."
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