可攻击的

This paper first analyses and summarizes the ststus quo and evolution trend of encryption, some common used cryptograph are introduced, including the algorithms used in symmetric cryptosystem and asymmetirc cryptosystem. We describe the theory of each algorithms and compare the elliptic curve cryptosystem with the other two asymmetric cryptosystems to show the advantages of this algorithm. Second, the principle of ECC is discussed, including the math foundation of ECC, basic conception of elliptic curves, constructiong idea of ECC, operation on the elliptic curve and so on. Third, the current attacks of ECC were analyzed deeply, and an algorithm based on limited prime number field was constructed. We analyzed its realizability in theory, and implement it by using certain function of MIRACL software package. Latter half in this paper, the implementation model of a simple elliptic curve encryption system which based on GF has been introduced. The paper also put a deep analysis on the algorithm of point addition and point multiplication.

本文首先对密码技术的发展现状及其发展趋势进行了分析和综述，详细的介绍了私钥密码系统和公钥密码系统的发展，说明各种算法的原理和优缺点，并给出了一些典型的密码体制的简要分析，重点将椭圆曲线算法与其它几种公钥密码算法比较，说明椭圆曲线算法的优势；其次，探讨了椭圆曲线密码体制的原理，包括椭圆曲线密码的数学基础、基本概念、椭圆曲线密码体制的构造思想等问题；第三作者对椭圆曲线的攻击现状作了详细的分析，针对所使用的大素数域F_p，设计了素数域上安全椭圆曲线产生的算法，从理论上做了可实施性分析，从软件上做了具体实现；在本文的后半部分，提出了一个简单的基于有限素数域上的椭圆曲线加密方按算实现模型，并对SECES中设计的点加和点乘运算进行了深入分析。

A global survey on computer security shows that havker attack brings a finite, restorable and redeemable loss while information leak can cause an irrevocable loss, some even a disaster.

国际安全界对近年来的计算机安全事件的研究表明：因黑客攻击造成的损失是有限的、可恢复和弥补的；信息泄漏事件造成的损失和带来的影响则是不可挽回的，甚至是灾难性的。

For preparing for the researches of text digital watermarking and advantaging other researchers" development when using the Chinese mathematical expression theory, this paper designs and realizes a development platform of Chinese mathematical expression. It has been proved by experiments that the platform"s function, execution speed and stability can satisfy the requirements of conversion and operation of enormous data.This research found out that the structure information of Chinese have plenty redundant information that can be used by the Chinese mathematical expression for the digital watermarking, the data embedded can possess better robustness. Based on this finding, this paper designs a kind of text digital watermarking method of embedding watermarking by using Chinese structure, and realizes the method by using the Chinese mathematical expression platform.Considering the watermarking embedding algorithms importance to the robustness of the text digital watermarking, this paper makes fully use of the advantage of the Chinese mathematical expression theory to design a kind of layered text method, which has being realized by using the Chinese mathematical expression platform. The layered text method can handle the text as a solid structure, and the embedding data havepreferable robustness.Finally, based on the researches of the text digital watermarking method and the text layered method, this paper integrates the method of making use of the Chinese structure embedding watermarking with the robust algorithm based on text layered, and realizes a brand-new text digital watermarking method. Proved by lots of experiments, this brand-new method has good robustness and better invisibility.

为了为研究工作做准备和方便其他使用汉字数学表达式理论体系的人进行开发，本文基于汉字数学表达式理论设计实现了一个汉字数学表达式平台，实现了Unicode汉字集中的汉字、汉字数学表达式、汉字的Unicode码之间的相互转化、依据汉字数学表达式提取汉字的结构信息、由汉字数学表达式在非中文平台上不依赖字库显示汉字的图像等功能，使用复合文档技术和流压缩技术进行数据的存储，使用对汉字数学表达式进行二叉树拆分来处理汉字数学表达式中包含的信息，使用自定义哈希函数来提高运行速度，实验证明，该平台功能、速度和稳定性完全能满足大量数据的转化和运算要求；通过研究表明汉字的结构信息中存在大量可使用汉字数学表达式理论加以利用的水印加载空间，加载在该空间的数据可以具有较好的鲁棒性，基于此，本文设计了一种利用汉字结构加载水印的文本数字水印方法，并使用汉字数学表达式平台将其实现；由于水印嵌入算法对于文本数字水印的鲁棒性至关重要，本文充分利用汉字数学表达式理论的优点，设计了一种文本分层的方法，并使用汉字数学表达式平台将其实现，使文本成为一个立体的空间，使嵌入在其中的数据具有更好的鲁棒性；最后在基于汉字数学表达式的文本数字水印嵌入方法的研究和基于汉字数学表达式的文本分层方法的研究的基础上，结合利用汉字结构嵌入水印的方法和基于文本分层的抗攻击文本水印嵌入算法实现了一种全新的文本数字水印方法，经实验证明，该方法有良好的鲁棒性和较好的隐蔽性。

Other people's noses are rudely assailed by the sharp fingers of the grim ice-king, but not my lady's; other people's lips turn pale and blue with the chilling influence of the bitter weather, but my lady's pretty little rosebud of a mouth retained its brightest colouring and cheeriest freshness.

别人的鼻子受到冷酷冰王的尖利手指的粗暴攻击，可爵士夫人的鼻子却保护得好好的；别人的嘴唇受到苦寒凛冽天气的影响，都冻得发白发青了，但爵士夫人俏丽的玫瑰花蕾似的小嘴，却保持了它最明媚的色彩和最欢乐的鲜艳。

A counterstrike mission. MIRVing these weapons would increase the effectiveness of each launcher, and when combined with the PLAN's evolving SSBN fleet would allow a smaller number of launch platforms to serve as a counterforce option and credible deterrent to any nuclear strike, should a "launch on warning" posture be adopted with sufficient support assets.

这些个导弹的分导式多弹头改装将增强每一部发射车的作战效能，联合神州海军成长中的弹道导弹核潜艇，就可使成为事实在少量发射平台的情况下执行还击使命，并且在有足够资源共同的情况下摆出一个&发射正告&的仪态，靠得住地威慑任何核攻击行为。

Following an attack by wolvers on his herd's peaceful home, something for which he takes responsibility, he heads off on a desperate, dangerous mission through icy blizzards and across wild terrain to find his father.

尼可的种群受到了狼的攻击，他认为自己应该担当起抗击的责任来。他开始了一项非常危险的工作-寻找他的父亲圣诞老人，这需要穿过暴风雪，跨过大片的荒地。

It passes from you into the hands of a loathsome companion: from him to a gang of blackmailers: copies of it are sent about London to my friends, and to the manager of the theatre where my work is being performed: every construction but the right one is put on it[26c]: Society is thrilled with the absurd rumours that I have had to pay a huge sum of money for having written an infamous letter to you: this forms the basis of your father's worst attack: I produce the original letter myself in Court to show what it really is: it is denounced by your father's Counsel as a revolting and insidious attempt to corrupt Innocence: ultimately it forms part of a criminal charge: the Crown takes it up: the Judge sums up on it with little learning and much morality: I go to prison for it at last.

先是从你传到了你一个缺德的同伴手中，从他再传到一伙敲诈之徒那里，弄成许多份在伦敦到处传流，寄给了我的朋友，还寄给了我的作品正在上演的剧院的经理：人们众说纷纭，可就是没有一个解释切中信的原意[26c]。社会为各种荒唐的谣言撩得耳热心跳：说是我因为写了一封不光彩的信给你而不得不付出一笔巨款。而你父亲又据此进行最为恶毒的攻击：我自己在法庭出示原信，说明真相，却被你父亲的辩护律师指为意在暗中败坏纯真心灵的邪恶企图，最终列为刑事罪状的一部分。刑事庭接受了这一指控，法官对此的总结陈词道学多而见识少：我到底还是因为这个进了监狱。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。