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Use strong Fiat-Shamir in proofs of decryption to protect against falsification of proofs

This commit is contained in:
Yingtong Li 2018-01-03 13:50:03 +08:00
parent 9255899a01
commit 7dc3a88b9b
Signed by: RunasSudo
GPG Key ID: 7234E476BF21C61A
1 changed files with 3 additions and 1 deletions
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eos/psr/crypto.py
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@ -144,7 +144,7 @@ class EGPrivateKey(EmbeddedObject):
result.commitmentA = pow(self.public_key.group.g, w, self.public_key.group.p)
result.commitmentB = pow(ciphertext.gamma, w, self.public_key.group.p)
result.challenge = SHA256().update_obj(ciphertext).update_obj(result.commitmentA).update_obj(result.commitmentB).hash_as_bigint()
result.challenge = SHA256().update_obj(ciphertext).update_obj(result.commitmentA).update_obj(result.commitmentB).update_obj(result.message).hash_as_bigint()
result.response = w + self.x * result.challenge
@ -175,6 +175,8 @@ class EGCiphertext(EmbeddedObject):
return ct.gamma == self.gamma and ct.delta == self.delta
class EGProvedPlaintext(EmbeddedObject):
_ver = StringField(default='0.6')
message = EmbeddedObjectField(BigInt)
ciphertext = EmbeddedObjectField()