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Objective Focusing on the security problem of authentication and confidentiality in the context of computer networks, a digital signature scheme was proposed based on the public key cryptosystem. Methods Firstly,the course of digital signature based on the public key cryptosystem was given. Then, RSA and ELGamal schemes were described respectively. They were the basis of the proposed scheme. Generalized ELGamal type signature schemes were listed. After comparing with each other, one scheme, whose Signature equation was (m r)x=j s modФ(p) , was adopted in the designing. Results Based on two well-known cryptographic assumptions, the factorization and the discrete logarithms, a digital signature scheme was presented. It must be required that s“ was not equal to p‘q“ in the signing procedure, because attackers could forge the signatures with high probabilities if the discrete logarithms modulo a large prime were solvable. The variable public key “e“ is used instead of the invariable parameter “3“ in Ham‘s signature scheme to enhance the security. One generalized ELGamal type scheme made the proposed scheme escape one multiplicative inverse operation in the signing procedure and one modular exponentiation in the verification procedure.Conclusion The presented scheme obtains the security that Harn‘s scheme was originally claimed. It is secure if the factorization and the discrete logarithms are simultaneously unsolvable. 相似文献
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王志敏 《郑州铁路职业技术学院学报》2006,18(2):17-19
人文主义始终是西方美术作品中所要表现的主题之一。随着社会环境的变化,人文主义在历史的不同时期内涵有所不同。西方原始美术的人文思想集中体现在对性、生殖的崇拜等方面;古希腊美术成熟期和文艺复兴时期美术的人文思想集中表现在对人性的歌颂和赞扬;西方现代美术中人文思想的表现则主要集中在个性的发展和探索。本文通过性、人性、个性来分析人文主义与西方美术的发展。 相似文献
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