KeyGeneration_for_CKKS_scheme

chayma · May 2, 2023, 1:44pm

Hi guys,
I wanna test key generation ( both public and secret key ) and parameters selection using CKKS scheme. Under the examples repository, most of files I have found represent functions (addition, multiplication, rotation…) we can apply using CKKS.
Any help PLEASE !!

chayma · May 2, 2023, 2:10pm

What is the method used to generate keys ?

iquah · May 2, 2023, 2:25pm

github.com

openfheorg/openfhe-development/blob/main/src/pke/examples/simple-real-numbers.cpp#L135


      
           cc->Enable(PKE);
           cc->Enable(KEYSWITCH);
           cc->Enable(LEVELEDSHE);
           std::cout << "CKKS scheme is using ring dimension " << cc->GetRingDimension() << std::endl << std::endl;
          
          
 // B. Step 2: Key Generation
           /* B1) Generate encryption keys.
          * These are used for encryption/decryption, as well as in generating
          * different kinds of keys.
          */
           auto keys = cc->KeyGen();
          
          
 /* B2) Generate the digit size
          * In CKKS, whenever someone multiplies two ciphertexts encrypted with key s,
          * we get a result with some components that are valid under key s, and
          * with an additional component that's valid under key s^2.
          *
          * In most cases, we want to perform relinearization of the multiplicaiton
          * result, i.e., we want to transform the s^2 component of the ciphertext so
          * it becomes valid under original key s. To do so, we need to create what we
          * call a relinearization key with the following line.

iquah · May 3, 2023, 4:51pm

Has this been resolved?

chayma · May 8, 2023, 1:22pm

Are the printed public and secret keys the values of the public and secret keys themselves, or are they the addresses in memory where these keys are stored?

iquah · May 8, 2023, 2:13pm

Addresses! If you look up their underlying implementation you’ll find that they are actually smart pointers

Click on the “private key” or “public key” (from Template Class KeyPair — OpenFHE documentation) and you should be redirected to smth like Typedef lbcrypto::PublicKey — OpenFHE documentation where it is shown that PublicKey = std::shared_ptr<PublicKeyImpl<Element>>

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KeyGeneration_for_CKKS_scheme

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