發(fā)布時間：2019-06-22 17:02

【摘要】：隨著當(dāng)前網(wǎng)絡(luò)技術(shù)的不斷發(fā)展,高校教育信息化已顯得越來越重要。遠(yuǎn)程教育作為教育信息化的重要組成部分被很多國家作為教育信息化的突破口。而作為遠(yuǎn)程教育重要組成部分的網(wǎng)上考試，更是提高工作效率、經(jīng)濟(jì)效益，發(fā)展和完善教育體系的必然選擇。 本文在深入分析現(xiàn)有網(wǎng)上考試系統(tǒng)的基礎(chǔ)上，探討了如何提高網(wǎng)上考試系統(tǒng)的安全性。論文第一部分為匿名答卷安全性，是利用群簽名技術(shù)，實現(xiàn)在確定合法考生身份之后，在教師人工閱卷時對考生身份進(jìn)行隱藏，而評分后公開考生身份，從而確保閱卷老師在評分時無法得知考生身份，保證評分的公正性。第二部分為系統(tǒng)中其他安全性。在網(wǎng)上考試系統(tǒng)中應(yīng)用新的身份認(rèn)證方式，引入加入隨機(jī)數(shù)的雙向認(rèn)證方式。在考生及閱卷老師登陸時，進(jìn)行雙向認(rèn)證，既對考生及閱卷老師的身份進(jìn)行認(rèn)證，同時對考試中心服務(wù)器進(jìn)行認(rèn)證，保證考試的安全性。此外選擇遺傳算法作為自動組卷算法，對生成試卷的速度有一定的保證。并根據(jù)組卷的特性對遺傳算法的選擇、交叉和變異算子作略微的改進(jìn)，使組卷算法的空間復(fù)雜度更小，這樣更容易得到期望的適應(yīng)度值，即得到更為隨機(jī)、科學(xué)、合理的試卷。利用自動組卷的功能，可以保證考試時試題的保密性，防止泄露。第三部分為系統(tǒng)設(shè)計與實現(xiàn)。從整體上對整個系統(tǒng)的設(shè)計進(jìn)行了研究，包括系統(tǒng)的設(shè)計流程等。按照從考生注冊到登錄，組卷到答卷交卷，教師的閱卷評分，一直到考試中心登記成績的流程進(jìn)對系統(tǒng)行了實現(xiàn)。 本文在網(wǎng)上考試系統(tǒng)中研究人工閱卷引發(fā)的匿名答題的問題，并利用群簽名技術(shù)實現(xiàn)了考生的匿名答題，以保證在人工閱卷過程中的公正性。在考試前，首先對合法考生的身份進(jìn)行驗證，，閱卷老師閱卷時，實現(xiàn)對考生身份的隱藏，但是在公布成績之后，又能夠保證考生對自己所答的試卷無法抵賴，從而滿足人工閱卷的公正性。本文設(shè)計的網(wǎng)上考試系統(tǒng)滿足了遠(yuǎn)程教育的需求，具有一定的實用價值。同時本文研究的群簽名技術(shù)、雙向身份認(rèn)證技術(shù)對于在電子政務(wù)、電子商務(wù)各個方面的應(yīng)用也有廣闊的發(fā)展前景，具有一定的實踐意義。
[Abstract]:With the continuous development of network technology, educational informatization in colleges and universities has become more and more important. As an important part of educational informatization, distance education has been used as a breakthrough in educational informatization in many countries. As an important part of distance education, online examination is an inevitable choice to improve work efficiency, economic benefit, development and improvement of education system. Based on the deep analysis of the existing online examination system, this paper discusses how to improve the security of the online examination system. The first part of the paper is the security of anonymous answer paper, which uses group signature technology to hide the identity of the examinee after determining the identity of the legitimate examinee, and to disclose the identity of the examinee after scoring, so as to ensure that the teacher can not know the identity of the examinee and ensure the fairness of the score. The second part is other security in the system. A new identity authentication method is applied in the online examination system, and a two-way authentication method with random numbers is introduced. When the examinee and the marking teacher log in, the two-way authentication is carried out, which not only authenticates the identity of the examinee and the marking teacher, but also authenticates the examination center server to ensure the security of the examination. In addition, genetic algorithm is selected as automatic test paper generation algorithm, which can ensure the speed of generating test paper. According to the characteristics of test paper formation, the selection of genetic algorithm, crossing and mutation operator are slightly improved, so that the spatial complexity of test paper generation algorithm is smaller, so that it is easier to get the desired adaptability value, that is, to get more random, scientific and reasonable test papers. By using the function of automatic test paper formation, the confidentiality of the test questions can be guaranteed and the leakage can be prevented. The third part is the system design and implementation. The design of the whole system is studied as a whole, including the design flow of the system and so on. According to the process from examinee registration to login, from test paper formation to answer paper submission, teachers' marking score, until the examination center registration results into the system to achieve. In this paper, the problem of anonymous answer questions caused by manual marking is studied in the online examination system, and the anonymous answer questions of candidates are realized by using group signature technology to ensure the fairness in the process of manual marking. Before the examination, the identity of the legal examinee is verified first, and the identity of the examinee is hidden when the marking teacher reads the test paper, but after announcing the results, the examinee can not deny the test paper answered by himself, thus satisfying the fairness of the manual marking. The online examination system designed in this paper meets the needs of distance education and has certain practical value. At the same time, the group signature technology and bidirectional identity authentication technology studied in this paper also have broad development prospects for the application of e-government and electronic commerce, and have certain practical significance.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP393.08

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本文編號：2504793