International Journal of Computer Network and Information Security @ijcnis
Journal articles - International Journal of Computer Network and Information Security
All articles: 1240
Criteria Specifications for the Comparison and Evaluation of Access Control Models
Scientific article
Nowadays, information systems cover all-important aspects of people's life, and computer applications are vastly used in widespread fields from medicine to military sector. Because of considerable dependence on computer-based systems, the security of the information saved in these systems is of great concern, and therefore, the complexity of data protection and availability of many modern systems are increasing. Access control is considered as the core of information security and the center of data protection and availability of needs. In the organizations, whose operations require the share of digital resources with different degrees of sensitivity, such an access control is crucially required. Considering the diverse structure, requirements, and specifications of an organization, and taking into account that access control policies and models are available in diverse forms, it is required to select and implement an appropriate access control model consistent with the security requirements of the related organization in order to achieve the best results and minimum access risks and threats. In this paper, the main and most important criteria in the different access control models are evaluated and finally, the most appropriate model is introduced for implementation based on the security policies and requirements of organizations and the specifications of each access control model.
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Cross Layer Transmission for AOS Packet Service
Scientific article
In this paper, the AOS packet service data transfers structure is presented first. Based on it, the effective throughput rate of AOS packet service is analyzed. Then, in order to improve the effective throughput rate, a scheme of AOS cross layer transmission system is presented. In the proposed scheme, based on the space channel state, the dynamic optimization parameters of network layer, Space Date Link Protocol sublayer and Sync and Channel Coding sublayer in AOS are selected. Then the switch thresholds are presented. Finally, the effective throughput rate of the proposed AOS cross layer transmission system is simulated. Simulations show that the throughput rate can be optimized effectively.
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Cryptography Using Multiple Two-Dimensional Chaotic Maps
Scientific article
In this paper, a symmetric key block cipher cryptosystem is proposed, involving multiple two-dimensional chaotic maps and using 128-bits external secret key. Computer simulations indicate that the cipher has good diffusion and confusion properties with respect to the plaintext and the key. Moreover, it produces ciphertext with random distribution. The computation time is much less than previous related works. Theoretic analysis verifies its superiority to previous cryptosystems against different types of attacks.
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