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Security for data transmission has a great importance in modern communication. Security for information involves defending information from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording or destruction. It is a general term that can be used regardless of the form the data may take. In this paper data in the binary form are transferred by embedding data bits into digital image bits in a pattern so that to enhance the security to data. For secured transmission of data, the data bits are hidden in the image bits using mathematical formula so that the main data cannot be recognized by unauthorized person.