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Implement DHE ciphers in IBM HTTP Server to provide Forward Secrecy to clients that do not support ECDHE ciphers
We use IBM HTTP Server 8.5.5 as HTTPS gateway in front of WebSphere Application Server portal system to service a multitude of different, external clients via internet. Those clients are outside our scope of influence, so we cannot dictate security policies, especially HTTPS cipher suites. Due to several SSL/TLS vulnerabilities in the last year we need to harden our TLS encryption setup on our webserver. Our goal is to provide a maximum of security while still being able to provide a high level of compatibility to older clients. By our corporate security policy we need to implement Forward Secrecy, which in principle works fine in IHS by using ECDHE ciphers. But a lot of our clients use Java6 and Java7, and these cannot use ECDHE ciphers. Thus Java6/7 can obtain Forward Secrecy only by using the standard DHE ciphers <=1024 bit. And since the standard 1024-bit DH Oakley Group 1 and 2 cannot be considered secure anymore, we need to be able to define custom DH-Groups with 1024 bit keysize in IBM HTTPServer.
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