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Guide to Generating and Using ECDSA Keys for SSH Authentication

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OpenSSH's ssh-keygen command can generate an ECDSA key pair using the -t ecdsa option and specifying a curve bit size with -b. The resulting private key must be kept secure, while the public key file needs to be installed on the target server for the specific user account. Installation can be done via ssh-copy-id, manual addition to the authorized_keys file, or through a service's settings interface. Successful login requires the server to support both public-key authentication and the specific ECDSA curve used, and troubleshooting involves verifying key matching and using verbose output for connection errors.

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