驗(yàn)證碼破解防范的技術(shù)研究和三維形式的設(shè)計(jì)與實(shí)現(xiàn)-免費(fèi)閱讀
【正文】 什么是奮斗？奮斗就是每天很難，可一年一年卻越來(lái)越容易。信息安全與通信保密，20106581【6】 Montree Imsamai amp。驗(yàn)證碼的模糊識(shí)別【J】。7. 展望將字符的種類從數(shù)字、字母拓展到漢字等方面，進(jìn)一步降低機(jī)器的識(shí)別成功率。圖206. 三維驗(yàn)證碼的設(shè)計(jì)：1）C（C Sharp）： Framework量身訂做的程序語(yǔ)言，C擁有C/C++的強(qiáng)大功能以及Visual Basic簡(jiǎn)易使用的特性，是第一個(gè)組件導(dǎo)向的程序語(yǔ)言，和C++與Java一樣亦為對(duì)象導(dǎo)向程序語(yǔ)言。圖132）三維驗(yàn)證碼：雖然是靜態(tài)的，但由于目前機(jī)器識(shí)別單個(gè)字符的概率僅有5%，識(shí)別整串字符就更是不可能。而對(duì)于簡(jiǎn)單的圖片，現(xiàn)代計(jì)算機(jī)的矢量法模式識(shí)別和折點(diǎn)定位【7】算法已有了一定的發(fā)展，擁有至少一半的識(shí)別能力。（圖10）圖9 圖10除了對(duì)字符驗(yàn)證碼的加工，有的還包括簡(jiǎn)單問(wèn)題的回答，如做計(jì)算和常識(shí)問(wèn)題，但它們都有不足。（圖4）圖43) 漢字：由于漢字?jǐn)?shù)量之多，筆畫(huà)之復(fù)雜，它的安全性就比前兩種高了不少。既然可以手動(dòng)提交驗(yàn)證碼，就一定能用程序自動(dòng)提交，本質(zhì)上就是向服務(wù)器發(fā)送HTTP協(xié)議數(shù)據(jù)包。此外，一種基于BP神經(jīng)網(wǎng)絡(luò)學(xué)習(xí)和支持向量機(jī)（SVM）訓(xùn)練【3】的驗(yàn)證碼識(shí)別方法分別利用了誤差反向傳播算法學(xué)習(xí)和最大間隔分類器建立方向合適的分隔超平面，并將兩種方法結(jié)合起來(lái)，對(duì)圖片具有干擾背景，字體變形，位置不定較為復(fù)雜的驗(yàn)證碼可以達(dá)到不錯(cuò)的效果。后來(lái)加入了文字，使得暴力破解的時(shí)間變得無(wú)限漫長(zhǎng)。同時(shí)，網(wǎng)站對(duì)賬號(hào)的保護(hù)并不能使用這種方法，所以驗(yàn)證碼應(yīng)運(yùn)而生。關(guān)鍵詞：網(wǎng)絡(luò)安全 ；識(shí)別與防范；三維驗(yàn)證碼；紋理旋轉(zhuǎn)；交互式操作Abstract:CAPTCHAs are usually used for network identification, which can prevent malicious cracking the passwords and meaningless content in forums to realize the Network security. This paper not only discusses the functions of CAPTCHAs and some mon methods of recognizing them, but also analyses the advantages and disadvantages of the CAPTCHAs widely used at present, and make parisons. The research concludes what characteristics a good CAPTCHA should have. Also it gets the result that many existing CPATCHAs are not very effective in keeping the Network safe.According to the research above, this paper proposes a new way, which creates a 3D CAPTCHA based on C. The CAPTHCA makes use of OpenGL to draw a sphere which can be controlled to rotate by the user, and projects the characters of the CAPTCHA onto its surface, and display the sphere on the screen, letting the users to finish the identification. The CAPTCHA has two main characters: a rotatable 3D texture and interactive operation, thus increasing the difficulty for puters to crack it, having high security and enablin
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