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The maximum size for a Diffie-Hellman key exchange supported is currently 2048 bits. There are many applications using bigger key sizes and z/OS would not be able to communicate with them. This enhancement would allow 4096-bit and higher key sizes for Diffie-Hellman.
Idea priority | Medium |
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I strongly support this idea. Since the beginning of 2023, the recommendations of the German Federal Office for Information Security regarding the cryptographic key length require at least 3000 bits for Diffie-Hellman [BSI TR-02102-2]. I suggest supporting "Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS)" as documented in IETF RFC 7919.