The most secure transfer protocol is HTTPS, which encrypts data transferred over the internet using SSL/TLS encryption.
The most secure File Transfer Protocol is SFTP, which provides secure file transfer and remote file system management capabilities over SSH.
The safest FTP protocol in terms of security is FTPS (FTP over SSL/TLS), which adds encryption to FTP to protect data in transit.
SFTP is generally considered more secure than FTPS because it encrypts both data and commands, whereas FTPS only encrypts data.
The most secure security protocol depends on the context, but SSL/TLS is widely regarded as one of the most secure protocols for securing communications over the internet.