| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 100 === Rapid developments in digital technologies have led ubiquitous access to digital multimedia. It brings people wide use of multimedia content in various mobile applications. The evolution makes pirates easy to copy and use multimedia content and products illegally. In previous encryption scheme of DRM systems for mobile devices, there were existing trade-off between performance and security. However, nowadays computational capability of mobile devices grows much stronger, and more and more high-performance mobile devices are widely used. Therefore we can focus on the security level of encryption scheme. In this thesis, we propose a new DRM system which can be implemented easily in mobile applications in order to prevent multimedia content from illegal distribution and copying. We use a block cipher with the concept of rand seed and position seed to enhance security level, and also devise the device-dependent certification in the license file by using DSA for the digital signature to prevent illegal distribution.
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