Hello, I’ve been wondering if there are plans to implement (rotation) key size reduction techniques for CKKS. In particular, I’m referring to [LLKN23] and the more recent [CKP25]. I’ve looked around the codebase and in this group but I have not been able to find anything mentioning the above works.
It is correct that we are not yet supporting the evaluation-key expansion techniques cited in your question. They can be useful for some applications, e.g., where we deal with low-power clients or other constrained devices. However, the priority of this capability has not reached yet the point where we are ready to add it to the next release. If anyone from the OpenFHE community wants to add it, we would be happy to include this feature in the plan for v1.5.
Thank for your reply Yuriy!