Number theory in science and communication
Number theory in science and communication
A cryptographic key generation scheme for multilevel data security
Computers and Security
Cryptographic solution to a problem of access control in a hierarchy
ACM Transactions on Computer Systems (TOCS)
Controlling access in large partially ordered hierarchies using cryptographic keys
Journal of Systems and Software
An efficient key assignment scheme for access control in a large leaf class hierarchy
Information Sciences: an International Journal
A secure effective key management scheme for dynamic access control in a large leaf class hierarchy
Information Sciences: an International Journal
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Recently, Hwang and Yang [J. Syst. Software 67 (2003) 99] proposed a cryptographic key assignment scheme for access control in large partially ordered hierarchies. In this paper, we show that their scheme is insecure against the collusion attack whereby some security classes conspire to derive the secret keys of other leaf security classes, which is not allowed according to the scheme.