Title: More DCCA-secure public-key encryptions from KEM + DEM style hybrid paradigms and some observations on the 'inner-outer' structure

Authors: Yuan Chen; Xiaofeng Chen; Hui Li

Addresses: State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an 710071, China ' State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an 710071, China ' State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an 710071, China

Abstract: Detectable Chosen Ciphertext Security (DCCA security) is a weaker notion than CCA security. An 'inner-outer' structure is shown to build a CCA-secure PKE from a DCCA-secure PKE, a 1-bounded CCA-secure PKE, and a CPA-secure PKE. In this paper, we first show passive security for DEMs is sufficient for achieving DCCA-secure hybrid PKEs both for KEM+DEM and Tag-KEM/DEM paradigms. Then two DCCA-secure PKEs constructed from CCA secure KEMs are presented. In addition, a counter example to show that the 1-bounded CCA secure component in the 'inner-outer' structure cannot be weakened to CPA one is given, and some possible methods for constructing CCA-secure PKEs from DCCA-secure KEMs are discussed.

Keywords: DCCA security; detectable chosen ciphertext; CCA security; KEM+DEM hybrid paradigm; public key encryption; inner-outer structure; cryptography; key encapsulation mechanism; KEM; data encryption mechanism; DEM.

DOI: 10.1504/IJGUC.2014.058246

International Journal of Grid and Utility Computing, 2014 Vol.5 No.1, pp.60 - 70

Received: 07 Dec 2012
Accepted: 20 Apr 2013
Published online: 29 Oct 2014 *

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