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- Implement encryption for the transmission of all sensitive information. This should include TLS for protecting the connection and may be supplemented by discrete encryption of sensitive files or nonHTTP based connections.
- TLS certificates should be valid and have the correct domain name, not be expired, and be installed with intermediate certificates when required.
- Failed TLS connections should not fall back to an insecure connection.
- Utilize TLS connections for all content requiring authenticated access and for all other sensitive information.
- Utilize TLS for connections to external systems that involve sensitive information or functions.
- Utilize a single standard TLS implementation that is configured appropriately.
- Specify character encodings for all connections.
- Filter parameters containing sensitive information from the HTTP referer, when linking to external sites.