Image Signing Key

Background

Images on https://stable.release.flatcar-linux.net, https://beta.release.flatcar-linux.net and https://alpha.release.flatcar-linux.net are signed with a GPG key with an ID of E25D9AED0593B34A. The key can be downloaded below.

Usage

Download the key and import it into your local GPG key ring:

$ cd /tmp
$ curl -LO https://www.flatcar-linux.org/security/image-signing-key/Flatcar_Image_Signing_Key.asc
$ gpg --import Flatcar_Image_Signing_Key.asc
gpg: key 0xE25D9AED0593B34A: public key "Flatcar Buildbot (Official Builds) <buildbot@flatcar-linux.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1

To verify the integrity of a file, you can now use GPG’s --verify command.

For example, to verify a flatcar_production_pxe_image.cpio.gz image file:

$ gpg --verify flatcar_production_pxe_image.cpio.gz.sig flatcar_production_pxe_image.cpio.gz

Image Signing Key

-----BEGIN PGP PUBLIC KEY BLOCK-----

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-----END PGP PUBLIC KEY BLOCK-----