Before adding a new GPG key to your account on your GitHub Enterprise Server instance, you should have:
Supported GPG key algorithms
GitHub Enterprise Server supports several GPG key algorithms. If you try to add a key generated with an unsupported algorithm, you may encounter an error.
- RSA
- ElGamal
- DSA
- ECDH
- ECDSA
- EdDSA
When verifying a signature, we extract the signature and attempt to parse its key-id. We match the key-id with keys uploaded to GitHub Enterprise Server. Until you upload your GPG key to GitHub Enterprise Server, we cannot verify your signatures.
Adding a GPG key
-  In the upper-right corner of any page, click your profile photo, then click Settings.  
-  In the user settings sidebar, click SSH and GPG keys.  
-  Click New GPG key.  
-  In the "Key" field, paste the GPG key you copied when you generated your GPG key.  
-  Click Add GPG key.  
-  To confirm the action, enter your GitHub Enterprise Server password.