apache-diffie-hellman.rst
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Diffie-Hellman Security
To secure your web server, the Guide to Deploying Diffie-Hellman for TLS contains important information worth reading. This link contains some good secure Apache configuration examples.
To secure your deployment of Diffie-Hellman, configure the following:
- Generate a strong Diffie-hellman group, 2048-bit or stronger.
# to generate your dhparam.pem file, run in the terminal openssl dhparam -out /etc/apache/ssl/dhparam.pem 2048
- Configure your server to only use modern, secure cipher suites in the virtual hosts configuration file.
# Set the protocol to only use modern, secure cipher suites. SSLProtocol all -SSLv2 -SSLv3 SSLHonorCipherOrder on SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA # Specify your DH params file as follows SSLOpenSSLConfCmd DHParameters "{path to dhparams.pem}"