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IEEE Transactions on Knowledge and Data Engineering
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IEEE Transactions on Knowledge and Data Engineering
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IEEE Transactions on Knowledge and Data Engineering
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Proceedings of the 13th ACM conference on Computer and communications security
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Information Processing Letters
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New constructions for provably-secure time-bound hierarchical key assignment schemes
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Information Processing Letters
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A note on time-bound hierarchical key assignment schemes
Information Processing Letters
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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.