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Now a day's information technology is a part of day to day's life. Everybody wants to store data in soft format in a central place so that it can be accessed any point of time. When a remote user tries accessing it through an unreliable network then data may not be secure. There are many techniques to secure data or message. Signcryption is one of the booming issues in the field of security. In 1997 Zheng introduce signcryption scheme by combining the techniques of digital signature then encryption in one step which reduces the computational cost and communication overhead. Signcryption also verifies the sender without reading content of the message by third party.
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