Security Analysis of a Time-Bound Hierarchical Key Assignment Scheme

Jeng-Shyang Pan,Tsu-Yang Wu,Chien-Ming Chen,Eric Ke Wang

doi:10.1109/iih-msp.2015.66

Security Analysis of a Time-Bound Hierarchical Key Assignment Scheme

Jeng-Shyang Pan, Tsu-Yang Wu + Show 2 more

https://doi.org/10.1109/iih-msp.2015.66

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Publication Date: Sep 1, 2015

Citations: 20

Affiliation: Shenzhen Institute of Information Technology, Harbin Institute of Technology, Fujian University of Technology

#Time-bound Hierarchical Key Assignment Scheme #Time-bound Hierarchical Key Assignment + Show 8 more

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Abstract

Recently, Wu et al. proposed a time-bound hierarchical key assignment (TBHKA) scheme which supports discrete time periods. In their scheme, it fused RSA and pairing-based cryptosystems and is provably secure. In this paper, we demonstrate a weakness of Wu et al.'s TBHKA scheme, ie. a collusion attack. Any two users can collude to compute an encryption key to access some class in an un-subcribing time period.

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