BGV : using KeySwitch

FHE Questions
1

Hello,

I am using Helib and I need to perform KeySwitch operations (i.e. from a ciphertext enc(m, pk_1), get a new ciphertext enc(m, pk_2)).
I see that there are KeySwitching procedures but I don’t understand how to use them in practice…
Thank you for your time !

2

Can you clarify your question? Do you want to do KeySwitching in HElib or in OpenFHE?

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3

I need it in HElib please :slightly_smiling_face:

4

I’m not sure this is the right place to ask your question. For library-related questions, this discourse is primarily focused on OpenFHE. Since your question is about a different library, you may want to try posting it on their corresponding channel.

But if you have questions about the KeySwitching algorithm, I can help you with that.

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5

My suggestion would be to switch to OpenFHE as HElib is no longer actively supported, and several authors of HElib are contributors to the OpenFHE project. We could answer your library-specific question in this case.

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6

Ok thank you ! So would it be possible if I switch to OpenFHE to use the KeySwitching procedure kind of like a reencryption key ?
edit : I just saw that openFHE supports Proxy Re-Encryption so i’ll switch to that, thank you very much (:

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