The "Server Keys" tab under the SFTP Server page allows you to create or select a host key for each of the three supported host key algorithms:
•RSA (1024-bit, 2048-bit, and 4096-bit)
•DSA/DSS (1024-bit, 2048-bit, and 4096-bit)
•ECDSA (256-bit, 384-bit, 521-bit)
When High Security Mode Encryption is enabled with the corresponding checkbox, the specified RSA key must be 2048-bits or greater, and DSA/DSS host keys are disabled.
The KeyInfo button will display the bit length, fingerprint, algorithm, and stored passphrase for the adjacent key.
All keys are stored in the PEM-encoded OpenSSH format.
