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threshold-fhe-5p.cpp
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threshold-fhe-5p.cpp
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//==================================================================================
// BSD 2-Clause License
//
// Copyright (c) 2014-2022, NJIT, Duality Technologies Inc. and other contributors
//
// All rights reserved.
//
// Author TPOC: contact@openfhe.org
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//==================================================================================
/*
Examples of threshold FHE for BGVrns, BFVrns and CKKS
*/
#include "openfhe.h"
using namespace lbcrypto;
void RunBFVrns();
void EvalNoiseBFV(PrivateKey<DCRTPoly> privateKey, ConstCiphertext<DCRTPoly> ciphertext, Plaintext ptxt, usint ptm,
double& noise, double& logQ, EncryptionTechnique encMethod);
int main(int argc, char* argv[]) {
std::cout << "\n=================RUNNING FOR BFVrns=====================" << std::endl;
RunBFVrns();
return 0;
}
void RunBFVrns() {
int plaintextModulus = 65537;
double sigma = 3.2;
lbcrypto::SecurityLevel securityLevel = lbcrypto::SecurityLevel::HEStd_128_classic;
usint batchSize = 16;
usint multDepth = 4;
usint digitSize = 30;
usint dcrtBits = 60;
lbcrypto::CCParams<lbcrypto::CryptoContextBFVRNS> parameters;
parameters.SetPlaintextModulus(plaintextModulus);
parameters.SetSecurityLevel(securityLevel);
parameters.SetStandardDeviation(sigma);
parameters.SetSecretKeyDist(UNIFORM_TERNARY);
parameters.SetMultiplicativeDepth(multDepth);
parameters.SetBatchSize(batchSize);
parameters.SetDigitSize(digitSize);
parameters.SetScalingModSize(dcrtBits);
parameters.SetMultiplicationTechnique(HPSPOVERQLEVELED);
CryptoContext<DCRTPoly> cc = GenCryptoContext(parameters);
// enable features that you wish to use
cc->Enable(PKE);
cc->Enable(KEYSWITCH);
cc->Enable(LEVELEDSHE);
cc->Enable(ADVANCEDSHE);
cc->Enable(MULTIPARTY);
////////////////////////////////////////////////////////////
// Set-up of parameters
////////////////////////////////////////////////////////////
// Output the generated parameters
std::cout << "p = " << cc->GetCryptoParameters()->GetPlaintextModulus() << std::endl;
std::cout << "n = " << cc->GetCryptoParameters()->GetElementParams()->GetCyclotomicOrder() / 2 << std::endl;
std::cout << "log2 q = " << log2(cc->GetCryptoParameters()->GetElementParams()->GetModulus().ConvertToDouble())
<< std::endl;
// Initialize Public Key Containers for two parties A and B
KeyPair<DCRTPoly> kp1;
KeyPair<DCRTPoly> kp2;
KeyPair<DCRTPoly> kpMultiparty;
////////////////////////////////////////////////////////////
// Perform Key Generation Operation
////////////////////////////////////////////////////////////
std::cout << "Running key generation (used for source data)..." << std::endl;
// Round 1 (party A)
std::cout << "Round 1 (party A) started." << std::endl;
kp1 = cc->KeyGen();
kp2 = cc->MultipartyKeyGen(kp1.publicKey);
auto kp3 = cc->MultipartyKeyGen(kp2.publicKey);
auto kp4 = cc->MultipartyKeyGen(kp3.publicKey);
auto kp5 = cc->MultipartyKeyGen(kp4.publicKey);
// Generate evalmult key part for A
auto evalMultKey = cc->KeySwitchGen(kp1.secretKey, kp1.secretKey);
auto evalMultKey2 = cc->MultiKeySwitchGen(kp2.secretKey, kp2.secretKey, evalMultKey);
auto evalMultKey3 = cc->MultiKeySwitchGen(kp3.secretKey, kp3.secretKey, evalMultKey);
auto evalMultKey4 = cc->MultiKeySwitchGen(kp4.secretKey, kp4.secretKey, evalMultKey);
auto evalMultKey5 = cc->MultiKeySwitchGen(kp5.secretKey, kp5.secretKey, evalMultKey);
auto evalMultAB = cc->MultiAddEvalKeys(evalMultKey, evalMultKey2, kp2.publicKey->GetKeyTag());
auto evalMultABC = cc->MultiAddEvalKeys(evalMultAB, evalMultKey3, kp3.publicKey->GetKeyTag());
auto evalMultABCD = cc->MultiAddEvalKeys(evalMultABC, evalMultKey4, kp4.publicKey->GetKeyTag());
auto evalMultABCDE = cc->MultiAddEvalKeys(evalMultABCD, evalMultKey5, kp5.publicKey->GetKeyTag());
auto evalMultEABCDE = cc->MultiMultEvalKey(kp5.secretKey, evalMultABCDE, kp5.publicKey->GetKeyTag());
auto evalMultDABCDE = cc->MultiMultEvalKey(kp4.secretKey, evalMultABCDE, kp5.publicKey->GetKeyTag());
auto evalMultCABCDE = cc->MultiMultEvalKey(kp3.secretKey, evalMultABCDE, kp5.publicKey->GetKeyTag());
auto evalMultBABCDE = cc->MultiMultEvalKey(kp2.secretKey, evalMultABCDE, kp5.publicKey->GetKeyTag());
auto evalMultAABCDE = cc->MultiMultEvalKey(kp1.secretKey, evalMultABCDE, kp5.publicKey->GetKeyTag());
auto evalMultDEABCDE = cc->MultiAddEvalMultKeys(evalMultEABCDE, evalMultDABCDE, evalMultEABCDE->GetKeyTag());
auto evalMultCDEABCDE = cc->MultiAddEvalMultKeys(evalMultCABCDE, evalMultDEABCDE, evalMultCABCDE->GetKeyTag());
auto evalMultBCDEABCDE = cc->MultiAddEvalMultKeys(evalMultBABCDE, evalMultCDEABCDE, evalMultBABCDE->GetKeyTag());
auto evalMultFinal = cc->MultiAddEvalMultKeys(evalMultAABCDE, evalMultBCDEABCDE, kp5.publicKey->GetKeyTag());
cc->InsertEvalMultKey({evalMultFinal});
//---------------------------------------------------
std::cout << "Running evalsum key generation (used for source data)..." << std::endl;
// Generate evalsum key part for A
cc->EvalSumKeyGen(kp1.secretKey);
auto evalSumKeys =
std::make_shared<std::map<usint, EvalKey<DCRTPoly>>>(cc->GetEvalSumKeyMap(kp1.secretKey->GetKeyTag()));
auto evalSumKeysB = cc->MultiEvalSumKeyGen(kp2.secretKey, evalSumKeys, kp2.publicKey->GetKeyTag());
auto evalSumKeysC = cc->MultiEvalSumKeyGen(kp3.secretKey, evalSumKeys, kp3.publicKey->GetKeyTag());
auto evalSumKeysD = cc->MultiEvalSumKeyGen(kp4.secretKey, evalSumKeys, kp4.publicKey->GetKeyTag());
auto evalSumKeysE = cc->MultiEvalSumKeyGen(kp5.secretKey, evalSumKeys, kp5.publicKey->GetKeyTag());
auto evalSumKeysAB = cc->MultiAddEvalSumKeys(evalSumKeys, evalSumKeysB, kp2.publicKey->GetKeyTag());
auto evalSumKeysABC = cc->MultiAddEvalSumKeys(evalSumKeysC, evalSumKeysAB, kp3.publicKey->GetKeyTag());
auto evalSumKeysABCD = cc->MultiAddEvalSumKeys(evalSumKeysABC, evalSumKeysD, kp4.publicKey->GetKeyTag());
auto evalSumKeysJoin = cc->MultiAddEvalSumKeys(evalSumKeysE, evalSumKeysABCD, kp5.publicKey->GetKeyTag());
cc->InsertEvalSumKey(evalSumKeysJoin);
////////////////////////////////////////////////////////////
// Encode source data
////////////////////////////////////////////////////////////
std::vector<int64_t> vectorOfInts1 = {1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1, 0};
std::vector<int64_t> vectorOfInts2 = {1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0};
std::vector<int64_t> vectorOfInts3 = {2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 0};
Plaintext plaintext1 = cc->MakePackedPlaintext(vectorOfInts1);
Plaintext plaintext2 = cc->MakePackedPlaintext(vectorOfInts2);
Plaintext plaintext3 = cc->MakePackedPlaintext(vectorOfInts3);
////////////////////////////////////////////////////////////
// Encryption
////////////////////////////////////////////////////////////
Ciphertext<DCRTPoly> ciphertext1;
Ciphertext<DCRTPoly> ciphertext2;
Ciphertext<DCRTPoly> ciphertext3;
ciphertext1 = cc->Encrypt(kp5.publicKey, plaintext1);
ciphertext2 = cc->Encrypt(kp5.publicKey, plaintext2);
ciphertext3 = cc->Encrypt(kp5.publicKey, plaintext3);
////////////////////////////////////////////////////////////
// Homomorphic Operations
////////////////////////////////////////////////////////////
Ciphertext<DCRTPoly> ciphertextAdd12;
Ciphertext<DCRTPoly> ciphertextAdd123;
ciphertextAdd12 = cc->EvalAdd(ciphertext1, ciphertext2);
ciphertextAdd123 = cc->EvalAdd(ciphertextAdd12, ciphertext3);
auto ciphertextMult1 = cc->EvalMult(ciphertext1, ciphertext1);
auto ciphertextMult2 = cc->EvalMult(ciphertextMult1, ciphertext1);
auto ciphertextMult3 = cc->EvalMult(ciphertextMult2, ciphertext1);
auto ciphertextMult = cc->EvalMult(ciphertextMult3, ciphertext1);
auto ciphertextEvalSum = cc->EvalSum(ciphertext3, batchSize);
////////////////////////////////////////////////////////////
// Decryption after Accumulation Operation on Encrypted Data with Multiparty
////////////////////////////////////////////////////////////
Plaintext plaintextAddNew1;
Plaintext plaintextAddNew2;
Plaintext plaintextAddNew3;
DCRTPoly partialPlaintext1;
DCRTPoly partialPlaintext2;
DCRTPoly partialPlaintext3;
Plaintext plaintextMultipartyNew;
const std::shared_ptr<CryptoParametersBase<DCRTPoly>> cryptoParams = kp1.secretKey->GetCryptoParameters();
const std::shared_ptr<typename DCRTPoly::Params> elementParams = cryptoParams->GetElementParams();
// Distributed decryption
// partial decryption by party A
auto ciphertextPartial1 = cc->MultipartyDecryptLead({ciphertextAdd123}, kp1.secretKey);
// partial decryption by party B
auto ciphertextPartial2 = cc->MultipartyDecryptMain({ciphertextAdd123}, kp2.secretKey);
// partial decryption by party C
auto ciphertextPartial3 = cc->MultipartyDecryptMain({ciphertextAdd123}, kp3.secretKey);
// partial decryption by party D
auto ciphertextPartial4 = cc->MultipartyDecryptMain({ciphertextAdd123}, kp4.secretKey);
// partial decryption by party E
auto ciphertextPartial5 = cc->MultipartyDecryptMain({ciphertextAdd123}, kp5.secretKey);
std::vector<Ciphertext<DCRTPoly>> partialCiphertextVec;
partialCiphertextVec.push_back(ciphertextPartial1[0]);
partialCiphertextVec.push_back(ciphertextPartial2[0]);
partialCiphertextVec.push_back(ciphertextPartial3[0]);
partialCiphertextVec.push_back(ciphertextPartial4[0]);
partialCiphertextVec.push_back(ciphertextPartial5[0]);
// Two partial decryptions are combined
cc->MultipartyDecryptFusion(partialCiphertextVec, &plaintextMultipartyNew);
std::cout << "\n Original Plaintext: \n" << std::endl;
std::cout << plaintext1 << std::endl;
std::cout << plaintext2 << std::endl;
std::cout << plaintext3 << std::endl;
plaintextMultipartyNew->SetLength(plaintext1->GetLength());
std::cout << "\n Resulting Fused Plaintext: \n" << std::endl;
std::cout << plaintextMultipartyNew << std::endl;
std::cout << "\n";
Plaintext plaintextMultipartyMult;
ciphertextPartial1 = cc->MultipartyDecryptLead({ciphertextMult}, kp1.secretKey);
ciphertextPartial2 = cc->MultipartyDecryptMain({ciphertextMult}, kp2.secretKey);
// partial decryption by party C
ciphertextPartial3 = cc->MultipartyDecryptMain({ciphertextMult}, kp3.secretKey);
// partial decryption by party D
ciphertextPartial4 = cc->MultipartyDecryptMain({ciphertextMult}, kp4.secretKey);
// partial decryption by party E
ciphertextPartial5 = cc->MultipartyDecryptMain({ciphertextMult}, kp5.secretKey);
std::vector<Ciphertext<DCRTPoly>> partialCiphertextVecMult;
partialCiphertextVecMult.push_back(ciphertextPartial1[0]);
partialCiphertextVecMult.push_back(ciphertextPartial2[0]);
partialCiphertextVecMult.push_back(ciphertextPartial3[0]);
partialCiphertextVecMult.push_back(ciphertextPartial4[0]);
partialCiphertextVecMult.push_back(ciphertextPartial5[0]);
cc->MultipartyDecryptFusion(partialCiphertextVecMult, &plaintextMultipartyMult);
plaintextMultipartyMult->SetLength(plaintext1->GetLength());
std::cout << "\n Resulting Fused Plaintext after Multiplication of plaintexts 1 "
"and 3: \n"
<< std::endl;
std::cout << plaintextMultipartyMult << std::endl;
std::cout << "\n";
Plaintext plaintextMultipartyEvalSum;
ciphertextPartial1 = cc->MultipartyDecryptLead({ciphertextEvalSum}, kp1.secretKey);
ciphertextPartial2 = cc->MultipartyDecryptMain({ciphertextEvalSum}, kp2.secretKey);
ciphertextPartial3 = cc->MultipartyDecryptMain({ciphertextEvalSum}, kp3.secretKey);
ciphertextPartial4 = cc->MultipartyDecryptMain({ciphertextEvalSum}, kp4.secretKey);
ciphertextPartial5 = cc->MultipartyDecryptMain({ciphertextEvalSum}, kp5.secretKey);
std::vector<Ciphertext<DCRTPoly>> partialCiphertextVecEvalSum;
partialCiphertextVecEvalSum.push_back(ciphertextPartial1[0]);
partialCiphertextVecEvalSum.push_back(ciphertextPartial2[0]);
partialCiphertextVecEvalSum.push_back(ciphertextPartial3[0]);
partialCiphertextVecEvalSum.push_back(ciphertextPartial4[0]);
partialCiphertextVecEvalSum.push_back(ciphertextPartial5[0]);
cc->MultipartyDecryptFusion(partialCiphertextVecEvalSum, &plaintextMultipartyEvalSum);
plaintextMultipartyEvalSum->SetLength(plaintext1->GetLength());
std::cout << "\n Fused result after summation of ciphertext 3: \n" << std::endl;
std::cout << plaintextMultipartyEvalSum << std::endl;
}