Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Creating GPG Keys. Creating GPG Keys Using the GNOME Desktop. Install the Seahorse utility, which makes GPG key management easier. From the main menu, select Applications Add/Remove Software. Select the Search tab and enter the name seahorse. Next: Key Management with GPG Up: I want to use Previous: Any other Linux distribution Contents Setting up GPG for the first time Before you can begin to use GPG for encryption, you should create a key pair. This step will create a secret key and a public key.
This page explains in detail how to obtain a GPG key using common Fedora utilities. It also provides information on managing your key as a Fedora contributor.
- 1Creating GPG Keys
- 2Making a Backup
- 3Making Your Public Key Available
- 6GPG Key Revocation
Creating GPG Keys
Creating GPG Keys Using the GNOME Desktop
Install the Seahorse utility, which makes GPG key management easier. From the main menu, select Applications > Add/Remove Software. Select the Search tab and enter the name seahorse. Select the checkbox next to the seahorse package and select Apply to add the software. You can also install Seahorse using the command line with the command su -c 'dnf install seahorse'.
To create a key, go the the Activities overview and select Passwords and Encryption Keys, which starts the application Seahorse.
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From the File menu select New.. then PGP Key then click Continue. Type your full name, email address, and an optional comment describing who you are (e.g.: John C. Smith, jsmith@example.com, The Man). Click Create. A dialog is displayed asking for a passphrase for the key. Choose a passphrase that is strong but also easy to remember. Click OK and the key is created.
To find your GPG key ID click on the My Personal Keys tab and look in the Key ID column next to the newly created key. In most cases, if you are asked for the key ID, you should prepend '0x' to the key ID, as in '0x6789ABCD'.
Now you should make a backup of your private key.
Creating GPG Keys Using the KDE Desktop
Start the KGpg program from the main menu by selecting Utilities > PIM > KGpg. If you have never used KGpg before, the program walks you through the process of creating your own GPG keypair.
A dialog box appears prompting you to create a new key pair. Enter your name, email address, and an optional comment. You can also choose an expiration time for your key, as well as the key strength (number of bits) and algorithms. The next dialog box prompts you for your passphrase. At this point, your key appears in the main KGpg window.
To find your GPG key ID, look in the Key ID column next to the newly created key. In most cases, if you are asked for the key ID, you should prepend '0x' to the key ID, as in '0x6789ABCD'.
Now you should make a backup of your private key.
Creating GPG Keys Using the Command Line
Use the following shell command:
This command generates a key pair that consists of a public and a private key. Other people use your public key to authenticate and/or decrypt your communications. Distribute your public key as widely as possible, especially to people who you know will want to receive authentic communications from you, such as a mailing list. The Fedora Documentation Project, for example, asks participants to include a GPG public key in their self-introduction .
A series of prompts directs you through the process. Press the Enter key to assign a default value if desired. The first prompt asks you to select what kind of key you prefer:
In almost all cases, the default is the correct choice. A RSA/RSA key allows you not only to sign communications, but also to encrypt files.
Next, choose the key size:
Again, the default is sufficient for almost all users, and represents an extremely strong level of security.
Next, choose when the key will expire. It is a good idea to choose an expiration date instead of using the default, which is none. If, for example, the email address on the key becomes invalid, an expiration date will remind others to stop using that public key.
Entering a value of 1y, for example, makes the key valid for one year. (You may change this expiration date after the key is generated, if you change your mind.)
Before the gpg program asks for signature information, the following prompt appears:
Enter y to finish the process.
Next, enter your name and email address. Remember this process is about authenticating you as a real individual. For this reason, include your real name. Do not use aliases or handles, since these disguise or obfuscate your identity.
Enter your real email address for your GPG key. If you choose a bogus email address, it will be more difficult for others to find your public key. This makes authenticating your communications difficult. If you are using this GPG key for self-introduction on a mailing list, for example, enter the email address you use on that list.
Use the comment field to include aliases or other information. (Some people use different keys for different purposes and identify each key with a comment, such as 'Office' or 'Open Source Projects.')
At the confirmation prompt, enter the letter O to continue if all entries are correct, or use the other options to fix any problems.
Finally, enter a passphrase for your secret key. The gpg program asks you to enter your passphrase twice to ensure you made no typing errors.
Finally, gpg generates random data to make your key as unique as possible. Move your mouse, type random keys, or perform other tasks on the system during this step to speed up the process. Once this step is finished, your keys are complete and ready to use:
The key fingerprint is a shorthand 'signature' for your key. It allows you to confirm to others that they have received your actual public key without any tampering. You do not need to write this fingerprint down. To display the fingerprint at any time, use this command, substituting your email address:
Your 'GPG key ID' consists of 8 hex digits identifying the public key. In the example above, the GPG key ID is 1B2AFA1C. In most cases, if you are asked for the key ID, you should prepend '0x' to the key ID, as in '0x1B2AFA1C'.
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Now you should make a backup of your private key. Including your revocation keys for all active keys ( this allows your revoking keys in the event of lost passphrase of key compromise)
Making a Backup
Making a Key Backup Using the GNOME Desktop
Right-click your key and select Properties. Select the Details tab, and Export, next to the Export Complete Key label. Select a destination filename and click Save.
Store the copy in a secure place, such as a locked container. Now you are ready to make your public key available to others .
Making a Key Backup Using the KDE Desktop
Right-click your key and select Export Secret Key. At the confirmation dialog, click Export to continue, then select a destination filename and click Save.
Store the copy in a secure place, such as a locked container. Now you are ready to make your public key available to others .
Making a Key Backup Using the Command Line
Use the following command to make the backup, which you can then copy to a destination of your choice:
Store the copy in a secure place, such as a locked container. Now you are ready to make your public key available to others .
Making Your Public Key Available
When you make your public key available to others, they can verify communications you sign, or send you encrypted communications if necessary. This procedure is also known as exporting.
You should now export your key using GNOME , KDE , or the command line . You can also copy your key manually to a file if you wish to email it to individuals or groups.
Exporting a GPG Key Using the GNOME Desktop
Export the key to a public keyserver where other project members can obtain it. Right-click the key and select Sync and Publish Keys.. (or in the seahorse menu bar click on the Remote menu and select Sync and Publish Keys..). Click Key Servers, select hkp://subkeys.pgp.net:11371 in the Publish Keys To combobox, click Close and then Sync.
You can now read more about safeguarding your key or use your browser to go back to a previous page.
Exporting a GPG Key Using the KDE Desktop
After your key has been generated, you can export the key to a public keyserver by right-clicking on the key in the main window, and selecting Export Public Keys. From there you can export your public key to the clipboard, an ASCII file, to an email, or directly to a key server. Export your public key to the default key server.
You can now read more about safeguarding your key or use your browser to go back to a previous page.
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Exporting a GPG Key Using the Command Line
Use the following command to send your key to a public keyserver:
For KEYNAME, substitute the key ID or fingerprint of your primary keypair.
This will send your key to the gnupg default key server (keys.gnupg.net), if you prefer another one use :
Replacing 'pgp.mit.edu' with your server of choice.
Passport command to generate keys. You can now read more about safeguarding your key or use your browser to go back to a previous page.
Copying a Public Key Manually
If you want to give or send a file copy of your key to someone, use this command to write it to an ASCII text file:
You can now read more about safeguarding your key or use your browser to go back to a previous page.
Safeguarding Your Secret Key
Treat your secret key as you would any very important document or physical key. (Some people always keep their secret key on their person, either on magnetic or flash media.) If you lose your secret key, you will be unable to sign communications, or to open encrypted communications that were sent to you.
Even if your secret key is accessed by someone else, they will be unable to use it without your passphrase. Do not choose a passphrase that someone else might easily guess. Do not use single words (in any language), strings of numbers such as your telephone number or an official document number, or biographical data about yourself or your family for a passphrase. The most secure passphrases are very long and contain a mixture of uppercase and lowercase letters, numbers, digits, and symbols. Choose a passphrase that you will be able to remember, however, since writing this passphrase down anywhere makes it immediately less secure.
Hardware Token options
If you followed the above, you have a secret key which is just a regular file. A more secure model than keeping the key on disk is touse a hardware token.
There are several options available on the market,for example the YubiKey. Look for a token which advertisesOpenPGP support. See this blog entry forhow to create a key with offline backups, and use the token for online access.
GPG Key Revocation
When you revoke a key, you withdraw it from public use. You should only have to do this if it is compromised or lost, or you forget the passphrase.
Generating a Revocation Certificate
When you create the key pair you should also create a key revocation certificate. If you later issue the revocation certificate, it notifies others that the public key is not to be used. Users may still use a revoked public key to verify old signatures, but not encrypt messages. As long as you still have access to the private key, messages received previously may still be decrypted. If you forget the passphrase, you will not be able to decrypt messages encrypted to that key.
If you do not use the --output flag, the certificate will print to standard output.
For KEYNAME, substitute either the key ID of your primary keypair or any part of a user ID that identifies your keypair. Once you create the certificate (the revoke.asc file), you should protect it. If it is published by accident or through the malicious actions of others, the public key will become unusable. It is a good idea to write the revocation certificate to secure removable media or print out a hard copy for secure storage to maintain secrecy.
Revoking a key
Once you locally revoke the key, you should send the revoked certificate to a keyserver, regardless of whether the key was originally issued in this way. Distribution through a server helps other users to quickly become aware the key has been compromised.
Export to a keyserver with the following command:
For KEYNAME, substitute either the key ID of your primary keypair or any part of a user ID that identifies your keypair.
See the Using_GPG page for more ideas on using your new GPG keys.