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Security of Chien's efficient time-bound hierarchical key assignment scheme

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1 Author(s)
Xun Yi ; Sch. of Comput. Sci. & Math., Victoria Univ., Melbourne, Vic., Australia

Recently, Chien proposed a time-bound hierarchical key assignment scheme based on tamper-resistant devices. Without public key cryptography, Chien's scheme greatly reduces computation load and implementation cost. In this paper, we show that Chien's scheme is insecure against a collusion attack whereby three users conspire to access some secret class keys that they should not know according to Chien's scheme.

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:17 ,  Issue: 9 )

Date of Publication:

Sept. 2005

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