A new digital signature scheme of ElGamal type on conic curve over the ring Zn

This paper analyzes the security of the existing ElGamal type digital signature scheme based on conic curve over the ring Z_n. According to the existing problems, we give a improved digital signature scheme named CCC-i-ElGamal. The theoretical certificates that the security of the proposed scheme is based on two hard mathematical problems. Not only retained the advantages of the conic curve simple operation and easily implementing, but also improved the new scheme´s security. And then applies the improved digital signature scheme into the field of XML digital signature, designs and implements an application system of student achievement of the XML signature. Finally, the system´s security and algorithm efficiency is analyzed and compared. It verifies the effects of the application of the proposed digital signature scheme in the field of XML digital signature. The experimental results show that the application system achieved the expected functionality and effectiveness. System security and the operating efficiency are improved further.