How to authenticate and encrypt in SFTP server using RSA/DSA algorithm in C#?

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C#3.5

How to connect to SFTP using RSA/DSA Algorithm in C#?


I want to connect to SFTP. Connectivity has to be done with authentication and encryption using RSA(1024 bits and 2048 bits)
DSA Algorithm(1024 bits) in C#.Currently I am connecting via SFTP Hosted Server Name and port and then Logging is done via the SFTP User credentails.

Current core code is as below:

objSFTP.Connect(sSFTPHost[0], int.Parse(sSFTPHost[1]));
                   objSFTP.Login(sSFTPHost[2], sSFTPHost[3]);

What I have tried:

objSFTP.Connect(sSFTPHost[0], int.Parse(sSFTPHost[1]));
                   objSFTP.Login(sSFTPHost[2], sSFTPHost[3]);