Ejemplo n.º 1
0
		def to_ciphertext(idx):
			ciphertext = Ciphertext(nbits, trustees[idx]['public_key_hash'])
			
			for i in xrange(0, len(commitment['encrypted_partial_private_keys'][idx])):
				ciphertext.append(long(commitment['encrypted_partial_private_keys'][idx][i]['alpha']), long(commitment['encrypted_partial_private_keys'][idx][i]['beta']))
			
			return ciphertext
	def to_ciphertext(idx):
		ciphertext = Ciphertext(nbits, PublicKey(cryptosystem, long(trustees[idx]["public_key"]["y"])).get_fingerprint())
		
		for i in xrange(0, len(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx])):
			ciphertext.append(long(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx][i]["alpha"]), long(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx][i]["beta"]))
		
		return ciphertext
Ejemplo n.º 3
0
			def to_ciphertext(idx):
				ciphertext = Ciphertext(nbits, trustees[idx]['public_key_hash'])
				
				for i in xrange(0, len(commitment['encrypted_partial_private_keys'][idx])):
					ciphertext.append(long(commitment['encrypted_partial_private_keys'][idx][i]['alpha']), long(commitment['encrypted_partial_private_keys'][idx][i]['beta']))
				
				return ciphertext
Ejemplo n.º 4
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    def ballots_as_cipher_collection(self):
        """
        Return a MixCipherCollection of the encrypted ballots.
        """
        mix_pk = self.mix_pk
        mix_nbits = self.mix_nbits
        mix_pkfinger = mix_pk.get_fingerprint()

        mix_collection = MixCiphertextCollection(mix_pk)
        add_ciphertext = mix_collection.add_ciphertext
        for v in self.encrypted_ballots:
            ballot = v.encrypted_ballot
            ct = MixCiphertext(mix_nbits, mix_pkfinger)
            ct.append(ballot['a'], ballot['b'])
            add_ciphertext(ct)
        return mix_collection
Ejemplo n.º 5
0
def shuffleQuestion(question):
    orig = CiphertextCollection(pk)
    for ballot in ballots[question]:
        ciphertext = Ciphertext(nbits, orig._pk_fingerprint)

        for choice in ballot["choices"]:
            ciphertext.append(long(choice["alpha"]), long(choice["beta"]))

        orig.add_ciphertext(ciphertext)

    print("Shuffling answers for question " + str(question))
    shuf, proof = orig.shuffle_with_proof()

    shufs_list.append(shuf.to_dict())
    proofs_list.append(proof.to_dict())

    print("Shuffle complete for question " + str(question))
Ejemplo n.º 6
0
def shuffleQuestion(question):
	orig = CiphertextCollection(pk)
	for ballot in ballots[question]:
		ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
		
		for choice in ballot["choices"]:
			ciphertext.append(long(choice["alpha"]), long(choice["beta"]))
		
		orig.add_ciphertext(ciphertext)
	
	print("Shuffling answers for question " + str(question))
	shuf, proof = orig.shuffle_with_proof()
	
	shufs_list.append(shuf.to_dict())
	proofs_list.append(proof.to_dict())
	
	print("Shuffle complete for question " + str(question))
Ejemplo n.º 7
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    def ballots_as_cipher_collection(self):
        """
        Return a MixCipherCollection of the encrypted ballots.
        """
        mix_pk = self.mix_pk
        mix_nbits = self.mix_nbits
        mix_pkfinger = mix_pk.get_fingerprint()

        mix_collection = MixCiphertextCollection(mix_pk)
        add_ciphertext = mix_collection.add_ciphertext
        for v in self.encrypted_ballots:
            ballot = v.encrypted_ballot
            ct = MixCiphertext(mix_nbits, mix_pkfinger)
            for x in ballot:
                ct.append(x['a'], x['b'])
            add_ciphertext(ct)
        return mix_collection
    def to_ciphertext(idx):
        ciphertext = Ciphertext(
            nbits,
            PublicKey(cryptosystem, long(
                trustees[idx]["public_key"]["y"])).get_fingerprint())

        for i in xrange(
                0,
                len(trustees[trustee]["commitment"]
                    ["encrypted_partial_private_keys"][idx])):
            ciphertext.append(
                long(trustees[trustee]["commitment"]
                     ["encrypted_partial_private_keys"][idx][i]["alpha"]),
                long(trustees[trustee]["commitment"]
                     ["encrypted_partial_private_keys"][idx][i]["beta"]))

        return ciphertext
Ejemplo n.º 9
0
	
	# Trustees
	trustees = json.loads(get_file("/trustees"))
	trusteeThreshold = int(election['trustee_threshold'])

# Verify mixes
for i in xrange(0, numMixnets):
	index = numMixnets - i - 1
	for q in xrange(0, numQuestions):
		with statusCheck("Verifying mix " + str(index) + " question " + str(q)):
			proof = ShufflingProof.from_dict(mixnets[index][1][q], pk, nbits)
			
			orig = CiphertextCollection(pk)
			if i == 0:
				for ballot in ballots:
					ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
					for block in ballot["vote"]["answers"][q]["choices"]:
						ciphertext.append(long(block["alpha"]), long(block["beta"]))
					orig.add_ciphertext(ciphertext)
			else:
				for ballot in mixnets[index + 1][0][q]["answers"]:
					ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
					for block in ballot["choices"]:
						ciphertext.append(long(block["alpha"]), long(block["beta"]))
					orig.add_ciphertext(ciphertext)
			
			shuf = CiphertextCollection(pk)
			for ballot in mixnets[index][0][q]["answers"]:
				ciphertext = Ciphertext(nbits, shuf._pk_fingerprint)
				for block in ballot["choices"]:
					ciphertext.append(long(block["alpha"]), long(block["beta"]))
Ejemplo n.º 10
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        ThresholdEncryptionCommitment(
            cryptosystem, len(trustees), election["trustee_threshold"], [
                long(x)
                for x in trustees[trustee]["commitment"]["public_coefficients"]
            ], [to_ciphertext(idx) for idx in range(0, len(trustees))]))

threshold_key = setup.generate_private_key(number, secret)

partial_decryptions = []

# Perform partial decryptions
for question in ballots:
    partial_decryption_q = []

    for ballot in question["answers"]:
        ciphertext = Ciphertext(nbits, pkf)
        for choice in ballot["choices"]:
            ciphertext.append(long(choice["alpha"]), long(choice["beta"]))

        partial_decryption = threshold_key.generate_partial_decryption(
            ciphertext)

        partial_decryption_q.append(partial_decryption)

    partial_decryptions.append(partial_decryption_q)

# Convert to Helios format
decryption_factors = [[[str(v.value) for v in decryption]
                       for decryption in question]
                      for question in partial_decryptions]
decryption_proofs = [[[{
Ejemplo n.º 11
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			vote_fingerprint = base64.b64encode(hashlib.sha256(vote_json).digest())[:-1]
			if ballot['vote_hash'] != vote_fingerprint:
				sc2.fail("Vote fingerprint does not match")

with statusCheck("Verifying mixes") as sc0:
	for i in xrange(0, numMixnets):
		index = numMixnets - i - 1
		with statusCheck("Verifying mix " + str(index), sc0) as sc:
			for q in xrange(0, numQuestions):
				with statusCheck("Verifying mix " + str(index) + " question " + str(q), sc) as sc2:
					proof = ShufflingProof.from_dict(mixnets[index][1][q], pk, nbits)
					
					orig = CiphertextCollection(pk)
					if i == 0:
						for ballot in ballots:
							ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
							for block in ballot["vote"]["answers"][q]["choices"]:
								ciphertext.append(long(block["alpha"]), long(block["beta"]))
							orig.add_ciphertext(ciphertext)
					else:
						for ballot in mixnets[index + 1][0][q]["answers"]:
							ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
							for block in ballot["choices"]:
								ciphertext.append(long(block["alpha"]), long(block["beta"]))
							orig.add_ciphertext(ciphertext)
					
					shuf = CiphertextCollection(pk)
					for ballot in mixnets[index][0][q]["answers"]:
						ciphertext = Ciphertext(nbits, shuf._pk_fingerprint)
						for block in ballot["choices"]:
							ciphertext.append(long(block["alpha"]), long(block["beta"]))