Public-key encryptions tolerating adaptive and composable adversaries

  • Authors:
  • Huafei Zhu

  • Affiliations:
  • I2R, A STAR, Singapore

  • Venue:
  • ISPEC'11 Proceedings of the 7th international conference on Information security practice and experience
  • Year:
  • 2011

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Abstract

It is a well-known result in the asynchronous model that no standard public-key encryption schemes tolerates adaptive adversaries in the universally composable framework. This paper provides a compiler technique that converts standard public-key encryptions tolerating nonadaptive and non-composable adversaries into interactive public-key encryptions tolerating adaptive and composable adversaries. The idea behind our compiler is that - a sender and a receiver interactively generate a mixed commitment on the fly. The generated mixed commitment is then used to set up a non-committing encryption channel between the sender and receiver on which arbitrary-many bits of messages are communicated. We show that the proposed interactive public-key encryption scheme realizes the uc-security in the presence of adaptive adversaries (i.e., the resulting interactive public-key encryption scheme tolerates adaptive and composable adversaries) assuming that the underlying mixed commitment scheme is secure in the common reference model.