Review of Adapter Signature Scheme Based on ISRSAC Digital Signature Algorithm

The RSA cryptosystem is well-known in the entire world. An adaptor signature system based on the ISRSAC digital signature algorithm has been proposed by Zhang, Liu, Yuan and Yang. This idea has been adapted from the ISRSAC scheme by Indian academics Thangavel and Varalakshmi. However, the ISRSAC algorithm may exist flaw. When Zhang, Liu, Yuan and Yang proposed their scheme based on ISRSAC algorithm, it also may occur same flaw. In this paper the authors analyze the security upon ISRSAC algorithm, it is our research goal. And the authors will mention the key point problem by mathematical proof and experimental data to ISRSAC algorithm, those are our methods. According the analyze results of
$\alpha(n)$
, it does not always an integer. Thus, this scheme has flaw and it is not secure. We conclude our claim in the final section.