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A digital signature does not protect you against a malicious actor who starts distributing outdated, vulnerable versions to you.

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How do i know you don't know what your talking about?....a mystery ;)

I mean replay attack and freeze attack as described in https://doi.org/10.1145/1455770.1455841 . It's very likely that I'm not up to date on mitigations in individual package managers.

>all of these package managers have vulnerabilities that can be exploited by a man-in-the-middle or a malicious mirror.

Well, that's how software is, but that article is from 2008 and things have gotten a lot better in the meantime (I think archlinux wasn't even signing their packages back then).

If the distribution's private keyring isn't compromised and you don't have third-party repos, your packages are as trustworthy as your distribution team (and upstream).

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