Date: Fri, 31 Aug 2018 12:18:03 +0000 From: vines@...eup.net To: oss-security@...ts.openwall.com Subject: Re: Travis CI MITM RCE > > 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. > True, yes, harder to brute-force a identical private key, than a key with an identical fingerprint. However, if someone hadn't considered the possibility of a SHA1 collision attack, and a signature verification fails, despite the fingerprint they see matching, what % of GPG users would skip signature verification? Perhaps due to confusion/self-doubt/inexperience/other. Admittedly, this could be stepping into the realm of social engineering.
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