SSL: Digital certificates encrypt data using Secure Sockets Layer (SSL) technology, the industry-standard method for protecting web communications developed by Netscape Communications Corporation. The SSL security protocol provides data encryption, server authentication, message integrity, and optional client authentication for a TCP/IP connection. Because SSL is built into all major browsers and web servers, simply installing a digital certificate turns on their SSL capabilities.
FTP: It promotes sharing of files and hence the indirect use of remote computers.The data through FTP is transfered reliably and efficiently. All data transfer takes place over the data connection.
Reference: Netscape Tech Brief
Prof. Ashay Dharwadker