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Iguana X invokes the ssh-keygen tool to generate the SSH keys required to authenticate with Git hosting services. SSH Key generation and registration with the Git hosting service is setup in Settings > My Git Git.
We store these keys on a per user basis in Iguana X. This way each user can be authenticated with their own Author Info when they make commits.
ssh-keygen is part of OpenSSH included in Windows 10 onwards. For some older windows server operating systems we instead look to find these tools as part of the GIT installation. See How does Iguana X find Git and ssh?