Constructions Secure against Receiver Selective Opening and Chosen Ciphertext Attacks.
Lecture Notes in Computer Science(2017)
摘要
In this paper we study public key encryption schemes of indistinguishability security against receiver selective opening (INDRSO) attacks, where the attacker can corrupt some receivers and get the corresponding secret keys in the multi-party setting. Concretely: We present a general construction of RSO security against chosen ciphertext attacks (RSO-CCA) by combining any RSO secure scheme against chosen plaintext attacks (RSO-CPA) with any regular CCA secure scheme, along with an appropriate non-interactive zero-knowledge proof. We show that the leakage-resistant construction given by Hazay et al. in Eurocrypt 2013 from weak hash proof system (wHPS) is RSO-CPA secure. We further show that the CCA secure construction given by Cramer and Shoup in Eurocrypt 2002 based on the universal HPS is RSO-CCA secure, hence obtain a more efficient paradigm for RSO-CCA security.
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关键词
Receiver selective opening,Chosen ciphertext security,Hash proof system
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