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Dell Update Packages User's Guide

PDF

Verifying the Digital Signature on Systems Running Linux

If you do not already have it installed on your system, you must install the Gnu Privacy Guard (GPG) to verify a Linux DUP digital signature. To use the standard verification procedure, perform the following steps:
  1. Get the Dell Linux public GnuPG key, if you do not already have it. You can download it by navigating to lists.us.dell.com and clicking the Dell Public GPG key link.
  2. Import the public key to the gpg trust database by running the following command: gpg --import <Public Key Filename>
    • NOTE: You must have a private key to complete the process.
  3. To avoid a distrusted-key warning, validate the public key by its fingerprint before you use it.
    1. Type the following command: gpg --edit-key 23B66A9D
    2. In the GPG key editor, type fpr. The following message appears: pub 1024D/23B66A9D 2001-04-16 Dell, Inc. (Product Group) <linux‑security@dell.com> Primary key fingerprint: 4172 E2CE 955A 1776 A5E6 1BB7 CA77 951D 23B6 6A9D . If the fingerprint of the imported key is the same as the key owner's, you have a correct copy of the key. You can verify the key's owner in person, over the phone, or by any other means that guarantees that you are communicating with the key's true owner.
    3. While still in the key editor, type sign.
    4. Answer the list of trust-validation questions that appear and create a passphrase to use as the secret key. You must import and validate the public key only once.
  4. Obtain the Linux DUP and its associated signature file from dell.com/support/manuals/downloads.
    • NOTE: Each Linux DUP has a separate signature file, which is displayed along with the DUP. You need both the DUP and its associated signature file for verification. By default, the signature file is named the same as the DUP filename with a sign extension.
  5. Verify the DUP using the following command: gpg --verify < Linux Update Package signature filename> < Linux Update Package filename>.

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