SFTP

SFTP is a highly secure file transfer protocol that uses Secure Shell (SSH) to provide encryption and operates through a single port.

Private Key: Uses a private key file for secure client authentication, pairing with a public key already configured on the server to ensure a highly secure, passwordless connection. Requires a file path to the private key file (e.g., .pem or .ppk) and an optional passphrase to decrypt the private key file if encrypted.

X.509 Certificate: Uses an X.509 certificate for authentication, including the public key and metadata signed by a trusted certificate authority, often used in enterprise setups for added validation. Requires a file path to the certificate file (e.g., .crt or .cer) and a passphrase to access the certificate's private key securely.