IE Gets Some Security Changes

SSLv2 was the first public version of SSL, and suffers from several well-known weaknesses--for example, it doesn't provide any protection against man-in-the-middle attacks during the handshake, and uses the same cryptographic keys are used for message authentication and for encryption. These and other problems have been fixed in SSLv3, but the older version is still supported by most browsers and is in use on some systems.

IE 7 will introduce some changes to the user experience, including blocking navigation to sites with problematic security certificates. The problems include certificates issued to a hostname other than the current URL's hostname--for example, secure.example.com instead of www.example.com; the certificate issued by an untrusted root; and expired or revoked certificates.