Computationally Sound Symbolic Secrecy in the Presence of Hash Functions
Computationally Sound Symbolic Secrecy in the Presence of Hash Functions
复制标题
存在哈希函数时计算合理的符号保密性
DOI:
10.1007/11944836_18
复制
发表时间:
2006
期刊:
影响因子:
--
通讯作者:
B. Warinschi
中科院分区:
文献类型:
--
作者:
V. Cortier;S. Kremer;Ralf Küsters;B. Warinschi
The standard symbolic, deducibility-based notions of secrecy are in general insufficient from a cryptographic point of view, especially in presence of hash functions. In this paper we devise and motivate a more appropriate secrecy criterion which exactly captures a standard cryptographic notion of secrecy for protocols involving public-key enryption and hash functions: protocols that satisfy it are computationally secure while any violation of our criterion directly leads to an attack. Furthermore, we prove that our criterion is decidable via an NP decision procedure. Our results hold for standard security notions for encryption and hash functions modeled as random oracles.