Solution to an attack on digital signature in SMS security

Short Message Service (SMS) is one of the mobile phone services widely used by the public worldwide. One of the main issues during the communication is information security and privacy. Digital Signature algorithms can be applied with the SMS cipher to prevent the message information from the repudiation attack. There are various existing algorithms for digital signature like RSA, DSA and ECDSA. Out of these, ECDSA has been proved and found the best algorithm in terms of efficiency and cryptanalysis. But ECDSA has some drawbacks also, and because of that some authors have proposed variant algorithms of ECDSA. In this paper, we propose solutions to an attack on digital signature that has been found on a variant of ECDSA. At the end of this paper, conclusion with the suitable solution approach with its security analysis is summarized.