You will probably want to enable your server to use both versions. Client certificates . If your server is running on an internal company intranet, you might have an internal CA, so all your clients would have certificates. In this case, you would allow only people with client certificates to connect to your server. A cipher is the algorithm used in encryption.
Some ciphers are more secure, or stronger, than others.
Generally speaking, the more bits a cipher uses during encryption, the harder it is to decrypt the data. This list doesn't appear unless you've installed security. When a client initiates an SSL connection with a server, it lets the server know what ciphers it prefers to use to encrypt information. In any two-way encryption process, both parties must use the same ciphers. Because there are a number of ciphers available, your server needs to be able to use the most popular ones.