Article: GPG and SSH key handling
This article shows how to handle GPG and SSH cryptographic keys for common use cases. Currently, it covers the importing and validation of my public keys.
GPG key
You can use my public GPG key for encrypting data you want to send to me privately and to check the authenticity of my signature in emails and tarball releases, for example. There are three main ways of obtaining my public GPG key:
- Using browser’s inline GPG handling capabilities. Try it!
- Receiving keys from a GPG key server. Try it!
- Manually downloading a GPG key file. Try it!
After you obtain my public key, it’s highly relevant that you verify the authenticity of the key by checking its fingerprint.
You might want to know that my GPG key is of type 2048-bit RSA, was
generated on 2013-01-12 and won’t expire. Its fingerprint is 7CB1
208C 7336 56B7 5962 2500 27B9 C6FD 28D6 18AF
.
Browser inline handling
If you are using a browser which supports handling GPG inline content, such as Mozilla-based browsers with the WebPG add-on, you can easily add my public GPG key in-lined below to your key-ring. Note that for this to work you need to enable inline formatting of GPG messages and keys.
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1 mQENBFDw5UABCAC0ehgsTvZ/WFuRdMvj9vpYodxN/A7V1Ln+RE4vPmsulHhc1eCr Wch7eLfKus77VG+818Z2kkuCk/Vn1uaUVNLeb1dZ7NbHRa+XOxCAAAAUWXmrk3q9 XBTHMWJJyhAmW5tGth6NKVkOIqURTuZwn2rx9CB8bEV/QBHoV3Uwg+gmV18W/2cc 51oU+KaS7hefSBDtOO/voT8xCAi63DmFELil9gK5U8moSqEzlb9KZI2KnBDleBuE lk09JmVVjH1pCxGjSB14xz4Wym1X7SLSjMZZNFaRJXQbviV2O+3nPXcGwJr2UR2+ jzdHN5Y0FmigW6X+wJRJgkYHCVZhG5EoSo21ABEBAAG0PEJydW5vIEbDqWxpeCBS ZXplbmRlIFJpYmVpcm8gKG9pdG9mZWxpeCkgPG9pdG9mZWxpeEBnbnUub3JnPokB OgQTAQIAJAIbAwIeAQIXgAIZAQUCUxo2jwULCQgHAwUVCgkICwUWAwIBAAAKCRAn ucb9KNYYr4zQB/44f4ur0vv3ZJKUdIPTynj+7E1XSvGhyNateUnPKQYz99hBQ3jF kh0jvfTZal9+Zeks88+wBWX5QcOIK0z1zCK+6WKi+vC9DlMsMrJAEZSFNBiSNUdc /qYAbQfWE9hJupLn/6LiJcyIOc/DUipFQ6ADI6gtRfZiTxohQiOwSy+DyXmwJ4u9 0lfZEemdIg97y9JiGrqB14QZRxn3r0RLT83vLpivKkkQP8+RiC9pyWZFgsTUeOcL CW+Yl9Wv45Uxb14N7iL2by+nFTOHHoZnUQ7yjp3CtEmkAv1T/JXL4Ul6FxemIgz7 sC75H6d1rcnMbIFtrS57n/YTmE1zDhy2P2JOiQE7BBMBAgAlAhsDAh4BAheAAhkB 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+SfynnZx3rl5v/x8e2tusPPJqAw2YpvyBYDYC7Qs17mXT3zHEcx3yG2GHtzGBqbz QTyI3EgAeyB+UB5VQZ1Q9TR3qE3TeDub4lPYEcy0vW4e446z4pPOkNaqFiWU66ar IR/aIxxrEq4++oN1qVwJRIdWSuCiIoRBN/7YtiaFjPDXO38ZYi4+qnoi5v4Jtn2G 9eApCVgyJdAJvBC8VbQ3x8i0Lj3lI6o1PPJX+yxoxNBzZrSnBP+kxXo= =LgHe -----END PGP PUBLIC KEY BLOCK-----
Receiving from a key server
My public GPG key can be found at
hkp://keys.gnupg.net/ and its ID is
0x28D618AF
. You can retrieve it by the following command:
$ gpg --recv-keys 0x28D618AF --keyserver hkp://keys.gnupg.net/
Manual download
Download my armored public GPG key from this server and then import it to your public key-ring using:
$ gpg --import oitofelix.gpg
Checking fingerprint
To verify the authenticity of the key you’ve imported to your public key-ring, enter the command:
$ gpg --fingerprint 0x28D618AF | sed -n '/^[[:blank:]]\+Key/s/^.*= //p'
It must print the following fingerprint: 7CB1 208C 7336 56B7
5962 2500 27B9 C6FD 28D6 18AF
.
Otherwise something is wrong! In that case don’t use the retrieved key to verify signatures or encrypt data, and contact me.
SSH key
You can use my public SSH key (2048-bit RSA) for granting me access to any computer you have an user account in and are allowed to make SSH connections to. To do that, follow the steps below logged in the system as the user you want to grant me access to.
First download my public SSH key and verify the authenticity of the key by running:
$ ssh-keygen -lf oitofelix.ssh | cut -f2 -d' '
It must print the following fingerprint:
c6:11:b0:09:0d:b7:0e:4b:49:d1:36:88:da:33:a3:6e
. Otherwise
something is wrong! In that case abort the procedure
at this step and contact me.
If the fingerprint is valid, you can safely add the key to your list of authorized SSH keys by issuing the following command:
$ cat oitofelix.ssh >> ~/.ssh/authorized_keys
It’s done! Contact me so we can proceed with the remote assistance.