An optimal algorithm to assign cryptographic keys in a tree structure for access control |
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Authors: | Horng-Twu Liaw Chin-Laung Lei |
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Institution: | (1) Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan 106, R.O.C. |
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Abstract: | In a computer communication system, there exists a possibility of two or more users collaborating to derive a key to which they are not entitled. Therefore, a method for ensuring the system is necessary. In this paper, we propose an efficient heuristic algorithm for assigning cryptographic keys among a group of users organized in a tree structure. Comparing with the existing assignment schemes, our scheme always produces economic cryptographic keys, which are smaller than the keys generated by the previous work in a tree structure.This work was supported in part by the National Science Council of the Republic of China under the grant NSC 81-0416-E-002-20. |
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Keywords: | D 4 6 |
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