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The Secure Socket Layer protocol runs above TCP/IP and below higher-level protocols such as HTTP or IMAP. It uses TCP/IP on behalf of the higher-level protocols, and in the process:
- allows an SSL-enabled server to authenticate itself to an SSL-enabled client,
- allows the client to authenticate itself to the server, and
- allows both machines to establish an encrypted connection.
The most common use in e-commerce is to allow form results to be sent encrypted from server to client. Look for this icon in the bottom right of your web browser's task bar when on a secure page to confirm it is in fact secure.
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