Abstract: Views can restrict database access on specifically attributes and tuples, so publishing views can reduce the possiblity of privacy disclosure. Howevere, the data owner will publish various views based on different application on different time, the dynamic and continuity of view dissemination made mutual contact and mutual influence among views. Considering the privacy disclosure of the publishing views themselves, which called static privacy disclosure, can not measure the disclosure accurately and can not adapt to the practical application, how to guarantee the security of the dynamic views dissemination must be resolved. To solve this problem, at first, the construction method of possible worlds and calculation method of privacy disclosure probability were propoded, and the calculating formulas of privacy disclosure probability under differrent conditions of views merging were presented. Then, the security determination formina for dynamic views was proposed from the point of relative sefe of view. Based on this, the safety dissemination method for dynamic views was presented, which can guarantee maximum level of views publishing upon relatively safe.

Key words: Views, Security, Probability, Privacy disclosure