Digital copyright protection method and system thereof

Abstract

The present invention discloses a digital copyright protection method, comprising that: a. a master key and a session key are randomly generated, and a personal decryption key of a user is generated basing on the identity information of the user; b. digital contents are encrypted by utilizing the session key to get a digital ciphertext; the session key and the master key are encrypted into a digital header in combination with a random number; the digital ciphertext and the digital header are broadcast to the user; c. after the user receives the digital ciphertext and the digital header, the digital header is decrypted to get the session key by utilizing the personal decryption key which is got on the basis of the public key infrastructure of identity, and the session key is utilized to decrypt the digital ciphertext to get the digital contents. The present invention also discloses a digital copyright protection system. The present invention can save key memory capacity and communication transmission bandwidth, effectively withstands collusion key attack, and traces at least one traitor that participates in pirating decryption apparatus structures.

Description

A digital copyright protection method and system thereof technical field The invention relates to digital copyright technology, in particular to a digital copyright protection system and its method. Background technique At present, digital content services have been widely used in various fields, including live broadcast, broadcast, and on-demand Internet TV services, mobile streaming media services, and digital multimedia services such as digital music, ringtones, books, pictures, and video programs that support online download and offline distribution. Internet value-added services and wireless data value-added services, etc. At the same time, illegal copying of digital content has increasingly become the main target of pirate groups. In order to ensure that digital content is not copied and protect the interests of digital content providers and operators, a Digital copyright protection technology. Existing digital copyright protection technologies, such as the TSZ sch...

AI Technical Summary

Problems solved by technology

First of all, as a public key traitor tracking scheme, the scheme cannot resist the anonymous piracy attack of a single user due to the disclosure of the encryption key parameter Q;

Second, the encryption key amount of this scheme is 2k+1 (where k is the security parameter of the system) group elements, which requires a large amount of storage in practical applications; the required communication transmission bandwidth is 2k+1 group elements elements, which occupy a large bandwidth in practical applications

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