Application Of Chaos Theory In The Digital Copyright Protection In Key Exchange

Digital Rights Management(DRM) is a system engineering related to technical, legal and business at all levels. It provides a safe and reliable protection technology in commercial operation of digital media. DRM technology ensures that the digital media content can be used legally. The core technology of DRM is to protect the security of information content, the authentication of digital multimedia user and key management effectively. Information encryption, key secure management and certificate management are mainly used in DRM systems security technology. Key is the most security factor in the DRM system. Therefore, how to ensure the security of key is directly related to the reliability of DRM system in the key security management system.As an important class of complex systems, Chaotic system has aroused widespread concern of many scholars at home and abroad. Chaotic systems are a class of dynamic systems containing discrete event subsystem and continuous variables subsystem. Since the chaotic systems have properties of initial sensitivity, and confusion and diffusivity, chaotic systems and cryptography have some causal relationship. Taking advantage of the characteristics of the chaotic system in the field of information security is the current hotspot. Classical encryption algorithms exist defects, for example, the speed of DES encryption is fast, but there are difficulties in key distribution and management, the safe of RSA algorithm is high, but the key space is relatively small, and the encryption and decryption is slow. Therefore, based on the characteristics of chaos theory, symmetric encryption algorithm and chaotic public key algorithm constructed by chaotic systems are proposed, and the parameters of chaotic systems are regarded as the key.This dissertation focuses on DRM key management system research, combined with its chaotic cryptography has been improved to achieve a secure key exchange. Arnold chaotic system was analyzed and improved to make it scrambling matrix of N N expansion of M N, and improves the performance of scrambling. Chaotic system of Arnold, Logistic, Henon chaotic constructed symmetric encryption algorithm, and verified by simulation experiments to verify the chaotic symmetric encryption algorithm safety and effectiveness. Logistic construct elliptic curve encryption algorithm and chaotic system out of the chaotic public key encryption algorithms, symmetric encryption algorithms chaotic main keys for encryption. The concept of chaos and chaos symmetric encryption algorithms are constructed based on public key encryption algorithm and combined with digital envelopes, the encrypted information and key encapsulation in the digital envelope of digital content protection also achieved key exchange.