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threshold-fhe.py
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from openfhe import *
from math import log2
def main():
print("\n=================RUNNING FOR BGVrns - Additive =====================")
RunBGVrnsAdditive()
print("\n=================RUNNING FOR BFVrns=====================")
RunBFVrns()
print("\n=================RUNNING FOR CKKS=====================")
RunCKKS()
def RunBGVrnsAdditive():
parameters = CCParamsBGVRNS()
parameters.SetPlaintextModulus(65537)
# NOISE_FLOODING_MULTIPARTY adds extra noise to the ciphertext before decrypting
# and is most secure mode of threshold FHE for BFV and BGV.
parameters.SetMultipartyMode(NOISE_FLOODING_MULTIPARTY)
cc = GenCryptoContext(parameters)
# Enable Features you wish to use
cc.Enable(PKE)
cc.Enable(KEYSWITCH)
cc.Enable(LEVELEDSHE)
cc.Enable(ADVANCEDSHE)
cc.Enable(MULTIPARTY)
##########################################################
# Set-up of parameters
##########################################################
# Print out the parameters
print(f"p = {cc.GetPlaintextModulus()}")
print(f"n = {cc.GetCyclotomicOrder()/2}")
print(f"lo2 q = {log2(cc.GetModulus())}")
############################################################
## Perform Key Generation Operation
############################################################
print("Running key generation (used for source data)...")
# generate the public key for first share
kp1 = cc.KeyGen()
# generate the public key for two shares
kp2 = cc.MultipartyKeyGen(kp1.publicKey)
# generate the public key for all three secret shares
kp3 = cc.MultipartyKeyGen(kp2.publicKey)
if not kp1.good():
print("Key generation failed!")
return 1
if not kp2.good():
print("Key generation failed!")
return 1
if not kp3.good():
print("Key generation failed!")
return 1
############################################################
## Encode source data
############################################################
vectorOfInts1 = [1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0]
vectorOfInts2 = [1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0]
vectorOfInts3 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 0]
plaintext1 = cc.MakePackedPlaintext(vectorOfInts1)
plaintext2 = cc.MakePackedPlaintext(vectorOfInts2)
plaintext3 = cc.MakePackedPlaintext(vectorOfInts3)
############################################################
## Encryption
############################################################
ciphertext1 = cc.Encrypt(kp3.publicKey, plaintext1)
ciphertext2 = cc.Encrypt(kp3.publicKey, plaintext2)
ciphertext3 = cc.Encrypt(kp3.publicKey, plaintext3)
############################################################
## EvalAdd Operation on Re-Encrypted Data
############################################################
ciphertextAdd12 = cc.EvalAdd(ciphertext1, ciphertext2)
ciphertextAdd123 = cc.EvalAdd(ciphertextAdd12, ciphertext3)
############################################################
## Decryption after Accumulation Operation on Encrypted Data with Multiparty
############################################################
# partial decryption by first party
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextAdd123], kp1.secretKey)
# partial decryption by second party
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextAdd123], kp2.secretKey)
# partial decryption by third party
ciphertextPartial3 = cc.MultipartyDecryptMain([ciphertextAdd123], kp3.secretKey)
partialCiphertextVec = []
partialCiphertextVec.append(ciphertextPartial1[0])
partialCiphertextVec.append(ciphertextPartial2[0])
partialCiphertextVec.append(ciphertextPartial3[0])
# partial decryption are combined together
plaintextMultipartyNew = cc.MultipartyDecryptFusion(partialCiphertextVec)
print("\n Original Plaintext: \n")
print(plaintext1)
print(plaintext2)
print(plaintext3)
plaintextMultipartyNew.SetLength(plaintext1.GetLength())
print("\n Resulting Fused Plaintext adding 3 ciphertexts: \n")
print(plaintextMultipartyNew)
print("\n")
def RunBFVrns():
batchSize = 16
parameters = CCParamsBFVRNS()
parameters.SetPlaintextModulus(65537)
parameters.SetBatchSize(batchSize)
parameters.SetMultiplicativeDepth(2)
## NOISE_FLOODING_MULTIPARTY adds extra noise to the ciphertext before decrypting
## and is most secure mode of threshold FHE for BFV and BGV.
parameters.SetMultipartyMode(NOISE_FLOODING_MULTIPARTY)
cc = GenCryptoContext(parameters)
cc.Enable(PKE)
cc.Enable(KEYSWITCH)
cc.Enable(LEVELEDSHE)
cc.Enable(ADVANCEDSHE)
cc.Enable(MULTIPARTY)
##########################################################
# Set-up of parameters
##########################################################
# Output the generated parameters
print(f"p = {cc.GetPlaintextModulus()}")
print(f"n = {cc.GetCyclotomicOrder()/2}")
print(f"lo2 q = {log2(cc.GetModulus())}")
############################################################
# Perform Key Generation Operation
############################################################
print("Running key generation (used for source data)...")
# Round 1 (party A)
print("Round 1 (party A) started.")
kp1 = cc.KeyGen()
# Generate evalmult key part for A
evalMultKey = cc.KeySwitchGen(kp1.secretKey, kp1.secretKey)
# Generate evalsum key part for A
cc.EvalSumKeyGen(kp1.secretKey)
evalSumKeys = cc.GetEvalSumKeyMap(kp1.secretKey.GetKeyTag())
print("Round 1 of key generation completed.")
# Round 2 (party B)
print("Round 2 (party B) started.")
print("Joint public key for (s_a + s_b) is generated...")
kp2 = cc.MultipartyKeyGen(kp1.publicKey)
evalMultKey2 = cc.MultiKeySwitchGen(kp2.secretKey, kp2.secretKey, evalMultKey)
print("Joint evaluation multiplication key for (s_a + s_b) is generated...")
evalMultAB = cc.MultiAddEvalKeys(evalMultKey, evalMultKey2, kp2.publicKey.GetKeyTag())
print("Joint evaluation multiplication key (s_a + s_b) is transformed into s_b*(s_a + s_b)...")
evalMultBAB = cc.MultiMultEvalKey(kp2.secretKey, evalMultAB, kp2.publicKey.GetKeyTag())
evalSumKeysB = cc.MultiEvalSumKeyGen(kp2.secretKey, evalSumKeys, kp2.publicKey.GetKeyTag())
print("Joint evaluation summation key for (s_a + s_b) is generated...")
evalSumKeysJoin = cc.MultiAddEvalSumKeys(evalSumKeys, evalSumKeysB, kp2.publicKey.GetKeyTag())
cc.InsertEvalSumKey(evalSumKeysJoin)
print("Round 2 of key generation completed.")
print("Round 3 (party A) started.")
print("Joint key (s_a + s_b) is transformed into s_a*(s_a + s_b)...")
evalMultAAB = cc.MultiMultEvalKey(kp1.secretKey, evalMultAB, kp2.publicKey.GetKeyTag())
print("Computing the final evaluation multiplication key for (s_a + s_b)*(s_a + s_b)...")
evalMultFinal = cc.MultiAddEvalMultKeys(evalMultAAB, evalMultBAB, evalMultAB.GetKeyTag())
cc.InsertEvalMultKey([evalMultFinal])
print("Round 3 of key generation completed.")
############################################################
## Encode source data
############################################################
vectorOfInts1 = [1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1, 0]
vectorOfInts2 = [1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0]
vectorOfInts3 = [2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 0]
plaintext1 = cc.MakePackedPlaintext(vectorOfInts1)
plaintext2 = cc.MakePackedPlaintext(vectorOfInts2)
plaintext3 = cc.MakePackedPlaintext(vectorOfInts3)
############################################################
## Encryption
############################################################
ciphertext1 = cc.Encrypt(kp2.publicKey, plaintext1)
ciphertext2 = cc.Encrypt(kp2.publicKey, plaintext2)
ciphertext3 = cc.Encrypt(kp2.publicKey, plaintext3)
############################################################
## Homomorphic Operations
############################################################
ciphertextAdd12 = cc.EvalAdd(ciphertext1, ciphertext2)
ciphertextAdd123 = cc.EvalAdd(ciphertextAdd12, ciphertext3)
ciphertextMult = cc.EvalMult(ciphertext1, ciphertext3)
ciphertextEvalSum = cc.EvalSum(ciphertext3, batchSize)
############################################################
## Decryption after Accumulation Operation on Encrypted Data with Multiparty
############################################################
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextAdd123], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextAdd123], kp2.secretKey)
partialCiphertextVec = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyNew = cc.MultipartyDecryptFusion(partialCiphertextVec)
print("\n Original Plaintext: \n")
print(plaintext1)
print(plaintext2)
print(plaintext3)
plaintextMultipartyNew.SetLength(plaintext1.GetLength())
print("\n Resulting Fused Plaintext: \n")
print(plaintextMultipartyNew)
print("\n")
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextMult], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextMult], kp2.secretKey)
partialCiphertextVecMult = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyMult = cc.MultipartyDecryptFusion(partialCiphertextVecMult)
plaintextMultipartyMult.SetLength(plaintext1.GetLength())
print("\n Resulting Fused Plaintext after Multiplication of plaintexts 1 and 3: \n")
print(plaintextMultipartyMult)
print("\n")
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextEvalSum], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextEvalSum], kp2.secretKey)
partialCiphertextVecEvalSum = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyEvalSum = cc.MultipartyDecryptFusion(partialCiphertextVecEvalSum)
plaintextMultipartyEvalSum.SetLength(plaintext1.GetLength())
print("\n Fused result after summation of ciphertext 3: \n")
print(plaintextMultipartyEvalSum)
def RunCKKS():
batchSize = 16
parameters = CCParamsCKKSRNS()
parameters.SetMultiplicativeDepth(3)
parameters.SetScalingModSize(50)
parameters.SetBatchSize(batchSize)
cc = GenCryptoContext(parameters)
# Enable features 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
print(f"p = {cc.GetPlaintextModulus()}")
print(f"n = {cc.GetCyclotomicOrder()/2}")
print(f"lo2 q = {log2(cc.GetModulus())}")
############################################################
## Perform Key Generation Operation
############################################################
print("Running key generation (used for source data)...")
# Round 1 (party A)
print("Round 1 (party A) started.")
kp1 = cc.KeyGen()
# Generate evalmult key part for A
evalMultKey = cc.KeySwitchGen(kp1.secretKey, kp1.secretKey)
# Generate evalsum key part for A
cc.EvalSumKeyGen(kp1.secretKey)
evalSumKeys = cc.GetEvalSumKeyMap(kp1.secretKey.GetKeyTag())
print("Round 1 of key generation completed.")
# Round 2 (party B)
print("Round 2 (party B) started.")
print("Joint public key for (s_a + s_b) is generated...")
kp2 = cc.MultipartyKeyGen(kp1.publicKey)
evalMultKey2 = cc.MultiKeySwitchGen(kp2.secretKey, kp2.secretKey, evalMultKey)
print("Joint evaluation multiplication key for (s_a + s_b) is generated...")
evalMultAB = cc.MultiAddEvalKeys(evalMultKey, evalMultKey2, kp2.publicKey.GetKeyTag())
print("Joint evaluation multiplication key (s_a + s_b) is transformed into s_b*(s_a + s_b)...")
evalMultBAB = cc.MultiMultEvalKey(kp2.secretKey, evalMultAB, kp2.publicKey.GetKeyTag())
evalSumKeysB = cc.MultiEvalSumKeyGen(kp2.secretKey, evalSumKeys, kp2.publicKey.GetKeyTag())
print("Joint evaluation summation key for (s_a + s_b) is generated...")
evalSumKeysJoin = cc.MultiAddEvalSumKeys(evalSumKeys, evalSumKeysB, kp2.publicKey.GetKeyTag())
cc.InsertEvalSumKey(evalSumKeysJoin)
print("Round 2 of key generation completed.")
print("Round 3 (party A) started.")
print("Joint key (s_a + s_b) is transformed into s_a*(s_a + s_b)...")
evalMultAAB = cc.MultiMultEvalKey(kp1.secretKey, evalMultAB, kp2.publicKey.GetKeyTag())
print("Computing the final evaluation multiplication key for (s_a + s_b)*(s_a + s_b)...")
evalMultFinal = cc.MultiAddEvalMultKeys(evalMultAAB, evalMultBAB, evalMultAB.GetKeyTag())
cc.InsertEvalMultKey([evalMultFinal])
print("Round 3 of key generation completed.")
############################################################
## Encode source data
############################################################
vectorOfInts1 = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 5.0, 4.0, 3.0, 2.0, 1.0, 0.0]
vectorOfInts2 = [1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
vectorOfInts3 = [2.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 0.0, 0.0]
plaintext1 = cc.MakeCKKSPackedPlaintext(vectorOfInts1)
plaintext2 = cc.MakeCKKSPackedPlaintext(vectorOfInts2)
plaintext3 = cc.MakeCKKSPackedPlaintext(vectorOfInts3)
############################################################
## Encryption
############################################################
ciphertext1 = cc.Encrypt(kp2.publicKey, plaintext1)
ciphertext2 = cc.Encrypt(kp2.publicKey, plaintext2)
ciphertext3 = cc.Encrypt(kp2.publicKey, plaintext3)
############################################################
## EvalAdd Operation on Re-Encrypted Data
############################################################
ciphertextAdd12 = cc.EvalAdd(ciphertext1, ciphertext2)
ciphertextAdd123 = cc.EvalAdd(ciphertextAdd12, ciphertext3)
ciphertextMultTemp = cc.EvalMult(ciphertext1, ciphertext3)
ciphertextMult = cc.ModReduce(ciphertextMultTemp)
ciphertextEvalSum = cc.EvalSum(ciphertext3, batchSize)
############################################################
## Decryption after Accumulation Operation on Encrypted Data with Multiparty
############################################################
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextAdd123], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextAdd123], kp2.secretKey)
partialCiphertextVec = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyNew = cc.MultipartyDecryptFusion(partialCiphertextVec)
print("\n Original Plaintext: \n")
print(plaintext1)
print(plaintext2)
print(plaintext3)
plaintextMultipartyNew.SetLength(plaintext1.GetLength())
print("\n Resulting Fused Plaintext: \n")
print(plaintextMultipartyNew)
print("\n")
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextMult], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextMult], kp2.secretKey)
partialCiphertextVecMult = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyMult = cc.MultipartyDecryptFusion(partialCiphertextVecMult)
plaintextMultipartyMult.SetLength(plaintext1.GetLength())
print("\n Resulting Fused Plaintext after Multiplication of plaintexts 1 and 3: \n")
print(plaintextMultipartyMult)
print("\n")
ciphertextPartial1 = cc.MultipartyDecryptLead([ciphertextEvalSum], kp1.secretKey)
ciphertextPartial2 = cc.MultipartyDecryptMain([ciphertextEvalSum], kp2.secretKey)
partialCiphertextVecEvalSum = [ciphertextPartial1[0], ciphertextPartial2[0]]
plaintextMultipartyEvalSum = cc.MultipartyDecryptFusion(partialCiphertextVecEvalSum)
plaintextMultipartyEvalSum.SetLength(plaintext1.GetLength())
print("\n Fused result after the Summation of ciphertext 3: \n")
print(plaintextMultipartyEvalSum)
if __name__ == '__main__':
main()