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COMPRESS MULTIPLE CIPHERTEXTS USING ELGAMAL ENCRYPTION SCHEMES

  • Kim, Myungsun (Department of Information Security The University of Suwon) ;
  • Kim, Jihye (School of Electrical Engineering Kookmin University) ;
  • Cheon, Jung Hee (CHRI & Department of Mathematical Sciences Seoul National University)
  • Received : 2012.04.10
  • Published : 2013.03.01

Abstract

In this work we deal with the problem of how to squeeze multiple ciphertexts without losing original message information. To do so, we formalize the notion of decomposability for public-key encryption and investigate why adding decomposability is challenging. We construct an ElGamal encryption scheme over extension fields, and show that it supports the efficient decomposition. We then analyze security of our scheme under the standard DDH assumption, and evaluate the performance of our construction.

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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