On the Security of Self-Certified Public Keys

Authors:
Cheng-Chi Lee;Min-Shiang Hwang;I-En Liao
Affiliations:
Fu Jen Catholic University, Taiwan;Asia University, Taiwan;National Chung Hsing University, Taiwan
Venue:
International Journal of Information Security and Privacy
Year:
2011

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Abstract

Many cryptosystems have been developed to solve the problem of information security, and some approaches are based on the self-certified public key proposed by Girault. In Girault's scheme, the public key is computed cooperatively by both the system authority SA and the user. One of the advantages is that the public key is able to implicitly authenticate itself without any additional certificates. Another advantage is that the SA is not able to forge a public key without knowing the user's secret key. Despite the advantages of Girault's system, in this paper, the authors demonstrate that the system still suffers from two main weaknesses. As a result, the authors propose a slight improvement on Girault's system.