椭圆曲线加密下的增强型代理多签名方案研究

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"Two Improved Proxy Multi-signature Schemes Based on the Elliptic Curve Cryptosystem" 本文探讨了基于椭圆曲线密码系统的两种改进的代理多签名方案。代理签名方案允许原始签名人将签名权限委托给一个代理签名人,代表原始签名人签署消息。而在代理多签名方案中,多个原始签名人协作将他们的签名权委托给一个代理签名人,使得该代理签名人可以代表整个群体签署消息。 在2003年,陈、钟和黄提出了一种基于椭圆曲线的代理保护代理多签名方案(简称CCH1方案)。然而,朴等人后来指出CCH1方案存在安全隐患,但他们未能提供修改后的方案或新的安全方案。为了抵抗朴等人指出的来自原始签名人伪造攻击的问题,作者基于CCH1方案提出了一种改进的代理多签名方案。这一改进旨在增强方案的安全性,防止原始签名人滥用签名权。 2004年,陈、钟和黄又进一步提出了另一种改进的方案,可能是针对之前提出的方案进行优化,以解决已知的漏洞和潜在威胁。椭圆曲线密码系统在安全性上优于传统的基于大素数分解的公钥加密系统,因为其计算效率更高且安全性等价的密钥长度较短。 代理多签名方案的应用广泛,如在分布式系统、云计算、电子投票和多用户环境中的授权管理。这些方案的关键在于确保代理签名人只能按照原始签名人意愿行事,并且在原始签名人失去控制时能有效防止滥用。同时,它们需要提供足够的隐私保护,确保原始签名人身份的匿名性和不可追踪性。 本文的研究工作对于提高基于椭圆曲线密码的代理多签名方案的安全性和实用性具有重要意义。通过对现有方案的分析和改进,不仅能够提升系统的安全性,还能促进其在实际应用中的采纳。这为未来密码学研究和安全通信领域的进步提供了有价值的贡献。

用中文总结以下内容: A number of experimental and numerical investigations have been conducted to study the MBPP stack and wavy flow field characteristics with various designs [10,11]. T. Chu et al. conducted the durability test of a 10-kW MBPP fuel cell stack containing 30 cells under dynamic driving cycles and analyzed the performance degradation mechanism [12]. X. Li et al. studied the deformation behavior of the wavy flow channels with thin metallic sheet of 316 stainless steel from both experimental and simulation aspects [13]. J. Owejan et al. designed a PEMFC stack with anode straight flow channels and cathode wavy flow channels and studied the in situ water distributions with neutron radiograph [14]. T. Tsukamoto et al. simulated a full-scale MBPP fuel cell stack of 300 cm2 active area at high current densities and used the 3D model to analyze the in-plane and through-plane parameter distributions [15]. G. Zhang et al. developed a two-fluid 3D model of PEMFC to study the multi-phase and convection effects of wave-like flow channels which are symmetric between anode and cathode sides [16]. S. Saco et al. studied the scaled up PEMFC numerically and compared straight parallel, serpentine zig-zag and straight zig-zag flow channels cell with zig-zag flow field with a transient 3D numerical model to analyze the subfreezing temperature cold start operations [18]. P. Dong et al. introduced discontinuous S-shaped and crescent ribs into flow channels based on the concept of wavy flow field for optimized design and improved energy performance [19]. I. Anyanwu et al. investigated the two-phase flow in sinusoidal channel of different geometric configurations for PEMFC and analyzed the effects of key dimensions on the droplet removal in the flow channel [20]. Y. Peng et al. simulated 5-cell stacks with commercialized flow field designs, including Ballard-like straight flow field, Honda-like wavy flow field and Toyota-like 3D mesh flow field, to investigate their thermal management performance [21]. To note, the terms such as sinusoidal, zig-zag, wave-like and Sshaped flow channels in the aforementioned literatures are similar to the so called wavy flow channels in this paper with identical channel height for the entire flow field. The through-plane constructed wavy flow channels with periodically varied channel heights are beyond the scope of this paper [22,23].

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