Removing or Compressing Rotation Keys

Library Questions
1

Hi,
I have been reading Optimized Homomorphic Encryption Solution for Secure Genome-Wide Association Studies and in section II-J2 “Evaluation Key compression” is mentioned.
Is there an API available for removing or compressing the rotation keys that are not going to be used after a certain point in the program?

Thanks,
Eymen

2

Forgot to mention that I use CKKS.

3

Currently, this functionality is not available in OpenFHE. There is an issue created for this Add functionality for creating automorphism keys at a specified level · Issue #413 · openfheorg/openfhe-development · GitHub, and it will be added in the future. You can look at it to see more information (a limited version of compression was available in Palisade).

4

There is prototype for this (works only for BV key switching) at openfhe-genomic-examples/demo-logistic.cpp at main · openfheorg/openfhe-genomic-examples · GitHub (also check the lines calling SetKeyGenLevel)

5

Thank you for the quick replies!