Securely transfer files using the firewall friendly SFTP protocol. With this extension zFTPServer will support not only FTPS (SSL/TLS) but also SFTP version 3, 4, 5, and 6 of the SSH file transfer protocol.
SFTP uses SSH to transfer files. Unlike standard FTP, it encrypts both commands and data, preventing passwords and sensitive information from being transmitted in clear text over the Internet. It is similar to FTP, but because it uses a different protocol, you must use a FTP client that supports SFTP.
Public/private key authentication
Since zFTPServer can handle public/private keys for authentication, for instance generated with PuTTYGen, it is very robust and secure. The client keeps the private key secure on the client’s local computer and distributes the public key so that it may be imported into zFTPServer. zFTPServer will associate this public key with a user’s account and use it to verify that the client is using the correct key pair, effectively authenticating the account. zFTPServer supports any combination of allowing or requiering a specific private key from the client in addition to providing a password or not. You may even specify several public keys.