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(Note that the keys on the keyservers appear to have also collected some signatures from people who haven't performed any verification of the Master Keys.) We have collected a few third-party signatures on the Master Keys, in order to increase the chances that you can find a suitable trust path to them. We have not yet got round to this at the time of writing. We intend to arrange for the Master Keys to sign each other, to certify that the DSA keys and RSA keys are part of the same setup. The only signatures produced by the Master Keys, ever, should be the signatures on the other keys. Their purpose is to bind the other keys together and certify that they are all owned by the same people and part of the same integrated setup.
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(Some of the developers' machines have cable modem connections and might in theory be crackable, but of course the private keys are still encrypted, so the crack would have to go unnoticed for long enough to steal a passphrase.) A signature from a Release key protects you from almost any plausible attack. The Release keys are kept safe on the developers' own local machines, and only used to sign releases that have been built by hand. The Release keys have passphrases and we can be more careful about how we use them. But when you see a signature, you should always be certain of precisely what it guarantees and precisely what it does not. We know our sysadmin personally and trust him (both to be competent and to be non-malicious), and we take all reasonable precautions to guard the build machine. Of course, we don't believe any of those things is very likely. The sysadmin of the independent Unix box using his root privilege to steal the private keys and abuse them, or tampering with the binaries before they are signed. People tampering with the binaries before they are uploaded to the independent Unix box. People tampering with the PuTTY binaries between the PuTTY web site and you.
Therefore, a signature from one of the Development Snapshots keys DOES protect you against: After being built, the binaries are uploaded to this Unix box and then signed automatically. The keys themselves are stored on an independently run Unix box (the same one that hosts our Subversion repository).
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The actual snapshots are built on a team member's home Windows box. This is necessary, because the snapshots are generated every night without human intervention, so nobody would be able to type a passphrase. These keys are stored without passphrases. This section explains what those security levels are, and how far you can expect to trust each key. The various keys have various different security levels. RSA: Master Key, Release key, Snapshot key Therefore, we have six public keys in total: The Master Key is used to sign the other two keys, and they sign it in return. We supply a set of RSA keys, compatible with both GnuPG and PGP2, and also a set of DSA keys compatible with GnuPG.Ī Development Snapshots key, used to sign the nightly builds.Ī Releases key, used to sign actual releases.Ī Master Key. (Note that none of the keys, signatures, etc mentioned here have anything to do with keys used with SSH - they are purely for verifying the origin of files distributed by the PuTTY team.) This description is provided as both a web page on the PuTTY site, and an appendix in the PuTTY manual.Īs of release 0.58, all of the PuTTY executables contain fingerprint material (usually accessed via the -pgpfp command-line option), such that if you have an executable you trust, you can use it to establish a trust path, for instance to a newer version downloaded from the Internet. Here we identify our public keys, and explain our signature policy so you can have an accurate idea of what each signature guarantees. We create PGP signatures for all the PuTTY files distributed from our web site, so that users can be confident that the files have not been tampered with. Appendix E: PuTTY download keys and signaturesĪppendix E: PuTTY download keys and signatures.