Cryptography is the practice and study of hiding information. In modern times, cryptography is considered as a branch of both mathematics and computer science, and is affiliated closely with information theory, computer security, and engineering. A digital signature is reminiscent of an ordinary signature. They have the characteristic that they are easy for a user to produce, but difficult for anyone else to forge. Digital signatures can also be permanently tied to the Content of the message being signed. The main objective of this research is to develop digital signature schemes based on various mathematical hard problems to obtain efficient and Robust signature generation for intrinsic authentication applications like electronic voting, H...