Security in signcryption scheme
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Signcryption is a new cryptographic technology which provides both confidentiality and encryption. Before signcryption, confidentiality and encryption were considered separately. It means that encryption provided confidentiality and signature provided authenticity. In 1997, Zheng combined those two goals in one primitive scheme. By that way he was able to reduce computation and cost. After the primitive version of signcryption proposed by Zheng, many other types of signcryption were proposed. In this thesis, I will analyze Zheng’s signcryption scheme in different models proposed by other researchers. But initially we begin with a formal definition of signcryption, continuing with security models and their security issues. Then we present the advantages and disadvantages of those signcryption schemes and will analyze hybrid model of signcryption scheme. Finally, we will write future progress that might be done in signcryption. The thesis is theoretical in nature, there is no experimental work.