Abstract
Certificateless cryptography involves a Key Generation Center (KGC) which issues a partial key to a user and the user also independently generates an additional public/secret key pair in such a way that the KGC who knows only the partial key but not the additional secret key is not able to do any cryptographic operation on behalf of the user; and a third party who replaces the public/secret key pair but does not know the partial key cannot do any cryptographic operation as the user either. We call this attack launched by the third party as the key replacement attack. In ACISP 2004, Yum and Lee proposed a generic construction of digital signature schemes under the framework of certificateless cryptography. In this paper, we show that their generic construction is insecure against key replacement attack. In particular, we show that the security requirements of their generic building blocks are insufficient to support some security claim stated in their paper. We then propose a modification of their scheme and show its security in a new and simplified security model. We show that our simplified definition and adversarial model not only capture all the distinct features of certificateless signature but are also more versatile when compared with all the comparable ones. We believe that the model itself is of independent interest.
The second author was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 9040904 (RGC Ref. No. CityU 1161/04E )), and the third author was supported by National Natural Science Foundation of China (No.60373039, 90604018).
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Hu, B.C., Wong, D.S., Zhang, Z., Deng, X. (2006). Key Replacement Attack Against a Generic Construction of Certificateless Signature. In: Batten, L.M., Safavi-Naini, R. (eds) Information Security and Privacy. ACISP 2006. Lecture Notes in Computer Science, vol 4058. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11780656_20
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DOI: https://doi.org/10.1007/11780656_20
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-35458-1
Online ISBN: 978-3-540-35459-8
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