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147 lines
5.5 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How to List and Remove a GPG Key in Ubuntu)
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[#]: via: (https://www.2daygeek.com/how-to-list-and-remove-repository-gpg-key-in-ubuntu/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How to List and Remove a GPG Key in Ubuntu
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======
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Some time ago we wrote an article about **[removing the PPA repository from the Ubuntu system][1]**.
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The PPA repository keys will not be removed as part of removing the PPA repository, and they will remain on the system.
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Today we are going to show you how to list and remove the added GPG keys from Ubuntu system.
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### What’s GPG key?
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The GPG key (it means Gnu Privacy Guard, aka GnuPG) is a free software which provides cryptographic privacy and authentication.
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It allow users to communicate securely using public-key cryptography.
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### How Does the GPG Key Work on Repository?
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All packages are signed with a pair of keys consisting of a private key and a public key, by the package maintainer.
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A user’s private key is kept secret and the public key may be given to anyone the user wants to communicate.
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Whenever you add a new repository to your system, you must also add a repository key so that the APT Package Manager trusts the newly added repository.
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Once you’ve added the repository keys, you can make sure you get the packages from the correct source.
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### How to List Repository keys?
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apt-key is used to manage the list of keys used by apt to authenticate packages. Trusted keys are stored in the following locations.
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* **/etc/apt/trusted.gpg** – Keyring of local trusted keys, new keys will be added here.
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* **/etc/apt/trusted.gpg.d/** – File fragments for the trusted keys, additional keyrings can be stored here (by other packages or the administrator).
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Use the following command to list trusted keys with fingerprints.
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```
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$ sudo apt-key list
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/etc/apt/trusted.gpg
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--------------------
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pub rsa4096 2017-12-15 [SCEA]
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0A0F AB86 0D48 5603 32EF B581 B754 42BB DE9E 3B09
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uid [ unknown] https://packagecloud.io/AtomEditor/atom (https://packagecloud.io/docs#gpg_signing) [email protected]
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sub rsa4096 2017-12-15 [SEA]
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pub rsa4096 2016-04-22 [SC]
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B9F8 D658 297A F3EF C18D 5CDF A2F6 83C5 2980 AECF
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uid [ unknown] Oracle Corporation (VirtualBox archive signing key) [email protected]
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sub rsa4096 2016-04-22 [E]
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pub dsa1024 2007-03-08 [SC]
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4CCA 1EAF 950C EE4A B839 76DC A040 830F 7FAC 5991
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uid [ unknown] Google, Inc. Linux Package Signing Key [email protected]
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sub elg2048 2007-03-08 [E]
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pub rsa4096 2016-04-12 [SC]
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EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
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uid [ unknown] Google Inc. (Linux Packages Signing Authority) [email protected]
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sub rsa4096 2019-07-22 [S] [expires: 2022-07-21]
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/etc/apt/trusted.gpg.d/numix_ubuntu_ppa.gpg
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-------------------------------------------
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pub rsa1024 2013-08-13 [SC]
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43E0 7612 1739 DEE5 FB96 BBED 52B7 0972 0F16 4EEB
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uid [ unknown] Launchpad PPA for Numix Maintainers
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/etc/apt/trusted.gpg.d/snwh_ubuntu_ppa.gpg
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------------------------------------------
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pub rsa1024 2012-06-27 [SC]
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D320 D0C3 0B02 E64C 5B2B B274 3766 2239 8999 3A70
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uid [ unknown] Launchpad PPA for Sam Hewitt
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-archive.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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790B C727 7767 219C 42C8 6F93 3B4F E6AC C0B2 1F32
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2012) [email protected]
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
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uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) [email protected]
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
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------------------------------------------------------
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pub rsa4096 2018-09-17 [SC]
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F6EC B376 2474 EDA9 D21B 7022 8719 20D1 991B C93C
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2018) [email protected]
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```
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### How to Delete/Remove Repository keys?
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You can remove the repository key if it is no longer needed or if the repository has already been removed from the system.
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It can be deleted by entering the full key with quotes as follows (which has a hex value of 40 characters).
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```
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$ sudo apt-key del "D320 D0C3 0B02 E64C 5B2B B274 3766 2239 8999 3A70"
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OK
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```
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Alternatively, you can delete a key by entering only the last 8 characters.
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```
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$ sudo apt-key del 89993A70
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OK
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```
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Once you have removed the repository key, run the command **[apt command][2]** to refresh the repository index.
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```
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$ sudo apt update
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```
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You can verify that the above GPG key has been removed by running the following command.
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```
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$ sudo apt-key list
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/how-to-list-and-remove-repository-gpg-key-in-ubuntu/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/how-to-remove-delete-ppas-on-ubuntu-linux-mint/
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[2]: https://www.2daygeek.com/apt-command-examples-manage-packages-debian-ubuntu-systems/
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