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Requirements on encryption of web-based examination system were analyze, and different encryption technologies were used to meet the needs on three levels, including important data, core processing logic and some restricted functions. For important data, its confidentiality and integrity were realized. The core processing logic in ASP script was built in COM component. And some restricted functions were protected with hardware key. Encryption which protected data, code and function provided necessary safety for the web-based examination system. Keywords-web-based examination; data encryption; COM component; three-level encryption

TFIDF algorithm was used for feature weighting in text classification. But the result of classification was not very well because of lack of class information in feature weighting. The known class information in the training set was used to improve the traditional TFIDF feature weight algorithm. Class distinction ability and class description ability were introduced, respectively expressed by inverse class frequency and term frequency in class, document frequency in class. A new feature weight algorithm based on class information, TF_IDT, was proposed. Naive Bayes classifier was used to test the algorithm. The precision, recall and F1 measure were significantly increased. Macro F1 measure raise by 6.46%. It was proved to be useful for improving text classification to use class information in feature weighting. In addition, the computational complexity of the proposed algorithm was lower and more suitable for use in fields of limited computing capability. Keywords-text classification; feature weight; inverse class frequency; term frequency in class; document frequency in class

Examination System was necessary to separate teaching and testing. A web-based Examination System was developed with Java Web technologies. The system provided the functions, including question management, paper generation and test online. Also the combination of client-side programming and server-side programming techniques were used and analyzed. Keywords-Examination System; JSP; Model1; JavaScript

News Releasing System was a common web-based information release platform. A web-based news releasing system was developed with Java Web technology based on MVC design pattern, which included such functions as news displaying, news management and user management. And client-side programming technology, JavaBean and multi-tier design used for decoupling of code were analyzed. Keywords-News releasing system, MVC, Client side programming, Multi-tier design