tackle key problems
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Key management is the core problem of network system security, which deals with the correlative problems from key being generated to ultimately destroyed; it includes system initialization, key generation, key encasement, key distribution, key storage, key renovation, key destruction, etc. Thereinto key distribution and key storage are the two most intractable taches of key management.
密钥管理问题是网络系统安全中首要的核心问题,它是处理密钥自产生到最终销毁的整个过程中的有关问题,包括系统的初始化,密钥的产生、装入、分配、存储、更新、吊销和销毁等内容,而密钥的分配和存储是密钥管理中最为棘手的两个环节。
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The method includes steps: digital watermark technique is adopted to hide information of key data in not key data codes of compressed image; under protection of digital watermark, using protective backup for key data detects whether normal transmitted key data is correct or not so as to detect error code; carrying out cyclic mutual backup by using macro blocks in same positions in front and back macro block set; embedding coded motion vector in form of digital watermark to DCT transformation coefficient, and ensuring that video data are not influenced as best as one can; when error code occurs, if key data backup is correct, then the backup replaces former key data; otherwise, using mean value of key data in adjacent macro blocks within same frame to replace former key data approximately.
本发明中,采用数字水印技术在压缩图像的非关键数据编码中隐藏关键数据信息;通过数字水印保护下的关键数据保护备份来检测正常传输的关键数据是否正确,由此来检测传输误码;用前后宏块组中相同位置的宏块进行循环相互备份;对运动向量进行编码,然后以数字水印的形式嵌入到相对不重要的DCT变换系数中,同时保证视频数据尽量不受影响;在误码发生时,如果关键数据备份正确,则直接替代原关键数据,否则用同一帧内相邻宏块的关键数据的平均值近似替代原关键数据。
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According to the existence results of general equilibrium problems and vector equilibrium problems have been studied more and more. Inspired and motivated by these research results, this paper is devoted to study systematically a class of equilibrium problems, which is unify and extension of a large number of known equilibrium problems and variational inequalities problems. The research is carried on from three aspects.Firstly, in finitely continuous topological spaces, we introduce four new types of the system of generalized vector quasi-equilibrium problems, and we derive some existence results of a solution for the system of generalized vector quasi-equilibrium problems via the maximal element theorems in product finitely continuous topological spaces.Secondly, in complete metric spaces, we provide the Ekeland variational principle to equilibrium problems with set-valued maps. And via the Ekeland variational principle, existence results for vector equilibrium problem with set-valued maps and the system of vector equilibrium problem with set-valued maps.
针对一般的均衡问题和向量均衡问题解的存在性,已有许多研究成果,受这些成果的启发,本文主要从理论上较为系统地研究了一类均衡问题,它统一和推广了许多已有的均衡问题和变分不等式问题,研究分有三个方面;首先,在有限连续拓扑空间中,我们提出了四类广义向量拟均衡系,并借助于有限连续拓扑空间中的极大元定理讨论了这四类均衡系问题的解的存在性问题,然后,在完备度量空间中,我们给出了关于集值均衡问题的Ekeland变分原理,并利用Ekeland变分原理分别讨论了集值向量均衡问题和集值向量均衡系问题的解的存在性。
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Tackle to Tackle:吊钩原则钩到钩
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Tackle to Tackle:吊钩原则
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