[[!meta title="Verify the ISO image using Linux with Gnome"]] [[!inline pages="doc/get/signing_key_transition.inline" raw="yes"]]

Install seahorse-nautilus and shared-mime-info

You need to have recent enough versions of the seahorse-nautilus and shared-mime-info packages installed.

These packages are already installed in Tails.

The needed packages are available starting from:

In Debian Wheezy, the needed packages are only available as backports. See the setup instructions on the Debian Backports website to add them to your list of repositories. Then, to install the necessary packages, you can execute the following commands:
sudo apt-get update
sudo apt-get install seahorse-nautilus/wheezy-backports shared-mime-info/wheezy-backports
In Debian 8 (Jessie), Ubuntu 15.04 (Vivid), or later, to install the necessary packages, you can execute the following commands:
sudo apt update
sudo apt install seahorse-nautilus

If you are unable to install the necessary packages, try [[verifying the ISO using the command line|verify_the_iso_image_using_the_command_line]].

Get the Tails signing key

If you are using Tails, you already have the signing key. Otherwise, first download Tails signing key:

[[!inline pages="lib/download_tails_signing_key" raw="yes"]]

Your browser should propose you to open it with "Import Key". Choose this action. It will add Tails signing key to your keyring, the collection of OpenPGP keys you already imported:

[[!img import_key.png alt="What should the web browser do with this file? Open with: Import Key (default)" link="no"]]

You will get notified will the following message:

[[!img key_imported.png alt="Key Imported. Imported a key for Tails developers (offline long-term identity key) <tails@boum.org>" link="no"]]

Verify the ISO image

Now, download the cryptographic signature corresponding to the ISO image you want to verify:

[[!inline pages="lib/download_stable_i386_iso_sig" raw="yes"]]

Your browser should propose you to open it with "Verify Signature". Choose this action to start the cryptographic verification:

[[!img verify_signature.png alt="What should the web browser do with this file? Open with: Verify Signature (default)" link="no"]]

Browse your files to select the Tails ISO image you want to verify. Then, the verification will start. It can take several minutes:

[[!img verifying.png alt="Verifying" link="no"]]

If the ISO image is correct you will get a notification telling you that the signature is good:

[[!img good_signature.png alt="Goog Signature" link="no"]]

The GNOME notifications appear truncated on Tails 1.1 and later.
See [[!tails_ticket 7249]].

If the ISO image is not correct you will get a notification telling you that the signature is bad:

[[!img bad_signature.png alt="Bad Signature: Bad or forged signature." link="no"]]