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91.
WUZhi-ping YEDing-feng MAWei-ju 《武汉大学学报:自然科学英文版》2005,10(1):259-262
Algebraic attack was applied to attack Filter-Combiner model keystream generators. We proposed thetechnique of function composition to improve the model, and the improved model can resist the algebraic attack. A new criterion for designing Filter-Combiner model was also proposed: the total length L of Linear Finite State Machines used in the model should be large enough and the degree d of Filter-Combiner function should be approximate [L/2]. 相似文献
92.
YANGQing CHENKe-fei 《武汉大学学报:自然科学英文版》2005,10(1):289-292
Digital watermark can be used for image ownership verification or authentication. In this paper, we propose a new image authentication plan concentrating on its security performance. Digital watermark is first turbo coded, scaled and then processed in wavelet domain. To enhance security level, public key cryptosystem is utilized to replace traditional watermark key. Sinmlation results are finally given by experiment. 相似文献
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李滨 《西南民族学院学报(自然科学版)》2006,32(2):376-379
对EIGamal数字签名方案进行了分析,在指出其安全漏洞的同时,在已有方案的基础上,出了改进的新签名方案,在离散对数问题的困难性假设下,所构造的新方案是安全的. 相似文献
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New field of cryptography: DNA cryptography 总被引:6,自引:1,他引:6
XIAO Guozhen LU Mingxin QIN Lei LAI Xuejia 《科学通报(英文版)》2006,51(12):1413-1420
The vast parallelism, exceptional energy efficiency and extraordinary information density inherent in DNA molecules are being explored for computing, data stor- age and cryptography. In such research area, novel computers, data storage and cryptography mi… 相似文献
98.
WANG Youren WANG Li YAO Rui ZHANG Zhai CUI Jiang 《武汉大学学报:自然科学英文版》2006,11(6):1569-1572
Reconfigurable computing has grown to become an important and large field of research, it offers advantages over traditional hardware and software implementations of computational algorithms. The Advanced Encryption Standard (AES) algorithm is widely applied in government department and commerce. This paper analyzed the AES algorithms with different cipher keys, adopted a novel key scheduler that generated the round key real-time, proposed a dynamically reconfigurable encryption system which supported the AES algorithm with different cipher keys, and designed the architecture of the reconfigurable system. The dynamically reconfigurable AES system had been realized on FPGA. The result proves that the reconfigurable AES system is flexible, lower cost and high security level. 相似文献
99.
CHEN Jing CUI Guohua 《武汉大学学报:自然科学英文版》2006,11(6):1781-1784
In this paper, we propose a partially non-cryptographic security routing protocol (PNCSR) that protects both routing and data forwarding operations through the same reactive approach. PNCSR only apply public-key cryptographic system in managing token, but it doesn't utilize any cryptographic primitives on the routing messages. In PNCSR, each node is fair. Local neighboring nodes collaboratively monitor each other and sustain each other. It also uses a novel credit strategy which additively increases the token lifetime each time a node renews its token. We also analyze the storage, computation, and communication overhead of PNCSR, and provide a simple yet meaningful overhead comparison. Finally, the simulation results show the effectiveness of PNCSR in various situations. 相似文献
100.
针对基于单片机的电子密码锁的不足之处,介绍了一种基于FPGA的电子密码锁的设计方法。采用VHDL语言使用自顶而下的方法对系统进行了描述,并在FPGA芯片CycloneEP1C6Q240C8上实现。设计充分利用了FPGA的资源可编程特性,可高效率的对系统进行升级与改进。本文设计的密码锁可设置任意位密码,比一般的四位密码锁具有更高的安全可靠性,应用前景十分良好。 相似文献