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simplify phe code
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Sefik Ilkin Serengil 2025-03-14 16:17:57 +00:00 committed by GitHub
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@ -309,22 +309,14 @@ beta = DeepFace.represent("target.jpg")[0]["embedding"]
# build an additively homomorphic cryptosystem (e.g. Paillier) on-prem # build an additively homomorphic cryptosystem (e.g. Paillier) on-prem
cs = LightPHE(algorithm_name = "Paillier", precision = 19) cs = LightPHE(algorithm_name = "Paillier", precision = 19)
cs.export_keys("public.txt", public=True)
# encrypt source embedding # encrypt source embedding on-prem
encrypted_alpha = cs.encrypt(alpha) encrypted_alpha = cs.encrypt(alpha)
# restore the cryptosystem in cloud with only public key # dot product of encrypted & plain embedding in cloud - private key not required
cloud_cs = LightPHE(algorithm_name = "Paillier", precision = 19, key_file = "public.txt")
# dot product of encrypted and plain embedding pair in cloud
encrypted_cosine_similarity = encrypted_alpha @ beta encrypted_cosine_similarity = encrypted_alpha @ beta
# computed by the cloud but cloud cannot decrypt it - magic of homomorphic encryption! # decrypt similarity on-prem - private key required
with pytest.raises(ValueError, match="must have private key"):
cloud_cs.decrypt(encrypted_cosine_similarity)
# decrypt similarity
calculated_similarity = cs.decrypt(encrypted_cosine_similarity)[0] calculated_similarity = cs.decrypt(encrypted_cosine_similarity)[0]
# verification # verification