Single Sign on (sso) Mechanism Enhanced with Firewall Security in Multiple Service Provider

Single sign-on (SSO) is a new authentication mechanism that enables a legal user with a single credential to be authenticated by multiple service providers in a distributed computer network. Recently, Chang and Lee proposed a new SSO scheme and claimed its security by providing well-organized security arguments. To demonstrative that their scheme is actually insecure as it fails to meet credential privacy and soundness of authentication. Specifically,presented two impersonation attacks. The first attack allows a malicious service provider, who has successfully communicated with a legal user twice, to recover the user’s credential and then to impersonate the user to access resources and services offered by other service providers. In another attack, an outsider without any credential may be able to enjoy network services freely by impersonating any legal user or a nonexistent user. Identify the flaws intheir security arguments, to explain why attacks are possible against their SSO scheme. These attacks also apply to another SSO scheme proposed by Hsu and Chuang, which inspired the design of the Chang– Lee scheme. Moreover, by employing an efficient verifiable encryption of RSA signatures proposed by Ateniese, we propose an improvement for repairing the Chang–Lee scheme.To promote the formal study of the soundness of authentication as one open problem. IndexTerms—Authentication, distributed computer networks, information security, security analysis, single sign-on (SSO).