Every year, millions of pupils take part in the baccalaureate examination and the examinations of entrance to Universities or Colleges in Vietnam. It is significantly necessary to keep the secrecy of the questions of these important examinations in order to keep the their fairness and to protect the legal rights of the participants. In this document we exploit the new and very secure cryptographic algorithms, especially the Advanced Encryption Standard, to devise the practical and effective method for the examination security.

Abstract.The research of similarity between DNA sequences is an important problem in Bio-Informatics. In the traditional approach, the dynamic programming based pairwise alignment is used for measuring the similarity between two sequences. This method does not work well in a large data set. In this paper, we consider motif like the phrase of document and use text mining techniques for finding the frequent motifs, maximal frequent motifs, motif based association rules in a group of genes.

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