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In this paper we will show that how to increase the security in communication between two persons by using Sumudu transform & cryptography .In the first part of the paper we will consider one plain text (original message) and convert it to cipher text(text in hidden form) by applying Sumudu transform to trigonometric cosine function. In second part we will convert this cipher text to plain text by applying inverse Sumudu transform.doi:10.29121/ijesrt.v9.i12.2020.1 fatcat:2fwezlgz4zgrrd4o2iz22pkdf4