A way to provide strong encryption in an SSL connection with older Web browsers that support keys only up to 64 bits in length. If the server supports server-gated cryptography (SGC), it returns an SGC digital certificate to the Web browser, known as a "SuperCert," "Global-Server-ID" or "HyperSign." The SGC certificate instructs the Web browser to perform a follow-up handshake to establish keys of 128 bits and higher (for details of the SSL handshake, see SSL).|
It Used to Be Illegal
Prior to 2000, it was illegal for U.S. companies to export software that used encryption greater than 64 bits; however, financial organizations were permitted stronger ciphers, and server-gated cryptography was installed in the Web servers of those institutions. Subsequently, browsers support longer keys, and SGC is only useful with older browsers. See SSL.