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Wednesday, 14 February 2018

ON THE SECURITY OF A VARIANT OF ELGAMAL ENCRYPTION SCHEME

ON THE SECURITY OF A VARIANT OF ELGAMAL ENCRYPTION SCHEME

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.

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