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1. SECURITY ANALYSIS OF A SINGLE SIGN-ON MECHANISM FOR
DISTRIBUTED COMPUTER NETWORKS
ABSTRACT:
In this paper, however, we demonstrative that their scheme is actually insecure as it fails to meet
credential privacy and soundness of authentication. Specifically, we present 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. We identify the flaws in their security arguments to explain why attacks are
possible against their SSO scheme. Our 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.
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