[Bug 1461834] Re: 1024-bit signing keys should be deprecated

[Seth Arnold]

Jake, some progress is underway for Launchpad to automatically sign PPAs
with RSA4096 keys https://discourse.ubuntu.com/t/new-requirements-for-
apt-repository-signing-in-24-04/42854

It's also possible to dual-sign non-ppa repositories, eg:

curl -s http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease
| gpg --verify

This can really help migrating from unsafe key sizes to safe key sizes.

Thanks

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https://bugs.launchpad.net/bugs/1461834

Title:
  1024-bit signing keys should be deprecated

Status in Launchpad itself:
  New
Status in apt package in Ubuntu:
  Invalid
Status in gnupg2 package in Ubuntu:
  Confirmed

Bug description:
  1024-bit RSA was deprecated  years ago by NIST[1], Microsoft[2] and
  more recently by others[3].

  1024-bit signing keys are insufficient to guarantee the authenticity
  of software distributed from Launchpad.net including PPAs. There
  should be a mechanism to refuse signing keys below a minimum key
  length based on key type. 1024-bit signing keys should be deprecated
  and removed from Launchpad.net itself ASAP.  Future projects and PPAs
  should be disallowed from using 1024-bit signing keys.

  1. http://csrc.nist.gov/publications/nistpubs/800-131A/sp800-131A.pdf
  2. http://blogs.technet.com/b/pki/archive/2012/06/12/rsa-keys-under-1024-bits-are-blocked.aspx
  3. https://threatpost.com/mozilla-1024-bit-cert-deprecation-leaves-107000-sites-untrusted/108114

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