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Access control in a hierarchy plays an important role in today’s communication networks. To guarantee the quality of communication services it is necessary to construct a low-computation dynamic access control scheme for the use to obtain the secure information. Therefore, we propose an efficient identity-based cryptographic key assignment scheme in which the cryptographic key of each user is calculated through a one-way hash function. The key generation and key derivation are quite simple and the number of the public/secret parameters for each authenticated user is small; which will make our scheme very suitable for the hardware-limited users such as mobile units .

A new cryptographic key assignment scheme using a one-way hash function