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Debian Installation :: "Signing Keys" / Verify The File With MD-5, SHA-256?


Anyone attempting to install Debian Squeeze from CD-1, or Debian-live DVD will want to know how to verify the file with MD-5, SHA-256 and (available for some versions only) SHA-512 checksums of the iso images, using the appropriate signing key. But there are no instructions that I can find in the Debian CD FAQ, which simply points users at the archive keyring. Now according to this message, as of 9 Feb 2011 the Debian Squeeze archive signing key has fingerprint 9FED 2BCB DCD2 9CDF 7626 78CB AED4 B06F 4730 41FA

The Debian signing key website gives the archive signing key as the master key, and (this addresses the problem I raised elsewhere) even makes it available via https. That sounds good! Just one problem: the detached signatures for files such as url

which gives the SHA-256 sum for url

have been signed with a different key, which has fingerprint DF9B 9C49 EAA9 2984 3258 9D76 DA87 E80D 6294 BE9B

No wonder I am confused! And it seems that I may not be the only one; others seem to be confused also.

If no-one at the Debian mailing list can explain what is going on, I have little hope that anyone here will be able to clear this up, but I'll ask anyway: what are all the Debian related GPG keys and where do you find them all? is it true that there are different keys needed to verify CD iso images and debs? (And... what else?) where do you go to obtain all the lastest Debian keys via https? (This is important as it can hinder MITM attacks by lone crackers, assorted crooks, maybe even state actors, etc.; the "Comodogate" story provides clear evidence that there are people or organizations interested in mounting MITM attacks on persons downloading open-source software). in particular, it is sometimes convenient to use a live-CD to download an iso image (for example, when you no longer trust the system you are trying to upgrade!) and then one wants to use GPG to check the file with the checksum, so one needs to quickly locate and import into the GPG keyring of the (temporary) live-CD session the correct key; so where can I find the CD-signing key availalble via https? shouldn't the CD FAQ explain all this?


View 5 Replies (Posted: 2011-03-31 15:34)

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