Security of Chien's Efficient Time-Bound Hierarchical Key Assignment Scheme
September 2005 (vol. 17 no. 9)
pp. 1298-1299
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.
Index Terms:
Index Terms- Cryptography, hierarchical key assignment.
Citation:
Xun Yi, "Security of Chien's Efficient Time-Bound Hierarchical Key Assignment Scheme," IEEE Transactions on Knowledge and Data Engineering, vol. 17, no. 9, pp. 1298-1299, Sept. 2005, doi:10.1109/TKDE.2005.152