A. Gupta, R. Gross, et al.
SPIE Advances in Semiconductors and Superconductors 1990
In [1], Tzeng proposed a time-bound cryptographic key assignment scheme for access control in a partial-order hierarchy. In this paper, we show that Tzeng's scheme is insecure against the collusion attack whereby three users conspire to access some secret class keys that they should not know according to Tzeng's scheme.
A. Gupta, R. Gross, et al.
SPIE Advances in Semiconductors and Superconductors 1990
Elena Cabrio, Philipp Cimiano, et al.
CLEF 2013
Lerong Cheng, Jinjun Xiong, et al.
ASP-DAC 2008
Sabine Deligne, Ellen Eide, et al.
INTERSPEECH - Eurospeech 2001