In this paper, the author makes use of a new mathematical theory, i.e. P-sets to propose a new algorithm about encrypt, security transmission, and discovery -identification about information. This paper give the concepts of information internal contained and internal contained dependence based on P-set which has dynamic characteristic, discusses safe transfer-identification of information. Furthermore, a new algorithm is gotten. This algorithm not only decreases workload of encrypting information, but also provides an approach that can be used to identify received information based on P-set. The theory presented in this paper can be also used in data transfer and virus recovery-identification.