• Journal of KIISE:Computing Practices and Letters
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• v.8 no.1
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• pp.82-87
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• 2002

In the rapidly growing e-business area, the protection of information from hacking or tapping becomes very serious issue. Therefore, the more effective, convenient and secure methods are required to make the e-business more active. in this study, we develop the effective method of protecting digital contents on the public key infrastructure. To do this, we propose the partial encryption scheme to reduce the encryption time, and therefore, to release the server's workload. Our suggested scheme is believed to bring the strong competition to the portal service agents.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.1
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• pp.147-155
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• 2003

The diffusion of internet infrastructure and a fast increase of Population to use it is becoming a base of the service that can use various information, data and digital contents which were provided through off-line physically and used. Recently, the. techniques for copy deterrence and copyright protection have been important in e-commerce because various contents in digital form can be duplicated easily. The Access Control(AC) technique that only a user having the qualifications can access and use contents normally has been studied. The Conditional Access System(CAS) used in a satellite broadcasting md Digital Right Management System(DRMS) used for contents service are representative models of current commercialized access control. The CAS and DRM can be considered as an access control technique based on the payment based type(PBT). This paper describe the access control method of payment free type(PFT) suggested in ［5］ which are independent on the payment structure. And then we suggest a new access control method of payment free type which is more efficient than the previous one.