Cryptanalysis on a parallel keyed hash function based on chaotic neural network

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 of the parallel keyed hash function.