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Now days many institutions and organizations needs to protect their information and secret data from theft and many other attempts to destroy and fabricate these data and information by unauthorized persons who tries to manipulate by the privacy of these institutions and organizations. So, it is necessary to find a secure way to protect such a data and information, therefore in this paper a new method proposed to develop the encryption techniques through using the McLaurin series as a new cryptosystem, and through using different cryptanalysis techniques and tools, the proposed method was inevitable against the different attacks, it is also a one way function technique.