Implementing Signcryption Algorithm

This paper presents what is the signcryption scheme and shows step-by-step the implementation of the signcryption algorithm. In this paper I provide an overview for the research that has been done so far in signcryption area. Here I also discuss about the extensions for the signcryption scheme and the security in signcryption. 2000 Mathematics Subject Classification:54A05, 54B05. Public key cryptography Cryptography word comes from the two ancient Greek words: “krypto”, which means “hidden” and “grafo”, which means “to write”. Cryptography meaning is how to make what you write obscure, unintelligible to everyone except whom you want to communicate with. It is believed that the oldest known text on which cryptography has been applied occurred some 4000 years ago in Egypt. The hieroglyphic inscriptions on a tomb were written with a number of unusual symbols to confuse or obscure the meaning of the inscriptions. Since the oldest times until the 1970s the cryptography was based on symmetric encryption. The data transferred from one system to another over public network can be protected by the method of encryption. On encryption the data is encrypted by any encryption algorithm using the ‘key’. Only the user having the access to the same ‘key’ can decrypt the encrypted data. This method is known as private key or symmetric key cryptography. There are several standard symmetric key algorithms defined: DES, 3DES, AES etc. These standard symmetric algorithms defined are proven to be highly secured and time tested. But the problem with these algorithms is the key exchange. The communicating parties require a shared secret, ‘key’, to be exchanged between them to