Welcome to the resource topic for 2024/1377
Title:
Security Strengthening of Threshold Symmetric Schemes
Authors: Ehsan Ebrahimi
Abstract:In this paper, we study the security definitions of various threshold symmetric primitives. Namely, we analyze the security definitions for threshold pseudorandom functions, threshold message authentication codes and threshold symmetric encryption. In each case, we strengthen the existing security definition, and we present a scheme that satisfies our stronger notion of security. In particular, we propose indifferentiability definition and IND-CCA2 definition for a threshold pseudorandom function and a threshold symmetric encryption scheme, respectively. Moreover, we show that these definitions are achievable. Notably, we propose the first IND-CCA2 secure threshold symmetric encryption scheme.
ePrint: https://eprint.iacr.org/2024/1377
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