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In page HTTPS:

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SSL (Secure Sockets Layer) and TLS (Transport Layer Security) encryption can be configured in two modes: simple and mutual. In simple mode, authentication is only performed by the server. The mutual version requires the user to install a personal client certificate in the web browser for user authentication.[1] In either case, the level of protection depends on the correctness of the implementation of the software and the cryptographic algorithms in use.[citation needed]