Abstract:
Recently, based on the Paillier cryptosystem [1], Yi et al. [2] proposed a distributed ElGamal cryptosystem which allows for both a much simpler distributed key generation procedure and distributed decryption of messages from a large plaintext domain. In this paper, we analyze the security of their proposed variant of ElGamal encryption scheme and demonstrate that their construction is not secure as claimed.
Recently, based on the Paillier cryptosystem [1], Yi et al. [2] proposed a distributed ElGamal cryptosystem which allows for both a much simpler distributed key generation procedure and distributed decryption of messages from a large plaintext domain. In this paper, we analyze the security of their proposed variant of ElGamal encryption scheme and demonstrate that their construction is not secure as claimed.
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