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In this paper, we analyze the security of a parallel keyed hash function based on chaotic neural network proposed by Xiao et al. recently. Weak keys and forgery attacks against Xiao et al.’s scheme are demonstrated. Both theoretical analysis and experimental results show that the parallel keyed hash function is not security. Besides, some improvement measures are presented to enhance the security...
Ecological security depends on the balance between human demands and actions in consumption and alteration of available resource base and the sustainability, vulnerability and resilience of land systems that provide the services. Any type of significant break down of the equilibrium will threat the ecological security of a particular region or a broader spatial scale. This is among particular interests...
Device and technology oriented policy making excessively depends on the knowledge and experiences of managers, but ignores the requirements and effects of the application environment. So the policy making is incomplete and liable to make mistakes. To solve the problem, hierarchy network security system model is designed. Policy making and representation methods are proposed based on the system modeling,...
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