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In this paper a new method is introduced to increase security in wireless sensor networks by using data-oriented random number generator to encrypt tag of frames. These tags are exclusive disjunction with output of data-oriented random number generator. Data-oriented is a new and applied theory which provides methods that models the concepts with data structures. This idea increases the security in multi levels. First level is provided by interleaving method, second one by seed value of pseudo-random number generators, third one by the initial distribution of number bank and finally by operations which is applied to the number bank.