A scheme, which uses flexible cryptographic key management upon adaptable time-token
constraint for a user hierarchy access control (UHAC) scheme, is proposed in this paper. For
adapting the changeability in a UHAC system, we propose a technique of assigning
independent time-token which is distributed by a trusted agency server to reply an authorized
user for once secure access request. The key feature of the technique is to adapt some secure
parameters in distributed time-token for responding to each legal access request. Further, all
class keys will be updated proactively by the concept of proactive key management, which
makes the advantage that is proven and free from the scenario of the collusive attack example
which proposed by Yi et al. in [18]. This cryptographic key assignment scheme based on the
difficulty in solving a discrete logarithm, with adaptable time-token constraint, can achieve
better security and more efficient management, than the conventional UHAC scheme.
Besides, our scheme provides a flexible manner and dynamic key management to increase the
availability of user access in UHAC structure
Relation:
International Journal of Multimedia and Ubiquitous Engineering
