Multimedia content protection and safe distribution method in cloud environment

Abstract

The invention discloses a multimedia content protection and safe distribution method in a cloud environment. The method comprises steps of encrypting original data of a data owner DO; authorizing a data request of a data user DU; generating a watermark ciphertext; generating a re-encryption key; generating a watermark re-encryption ciphertext; and authorizing a user to decode the re-encryption ciphertext. Based on transition characteristics of the re-encrypted ciphertext, ciphertext data of the data owner is transformed into decodable ciphertext of the data owner and it is ensured that the transmission operator cannot obtain any information of the cleartext. According to the characteristics of orthogonal decomposition, the re-encryption algorithm is seamlessly combined with the digital watermark technology, so the method provided by the invention is formed. Computing and storing ability of the cloud computing can be well used and privacy and safe distribution of multimedia contents are ensured.

Description

technical field [0001] The invention belongs to the technical field of computer security, and relates to a multimedia content protection and safe distribution method, in particular to a multimedia content protection and safe distribution method in a cloud environment. Background technique [0002] The acceleration of informatization and the rapid development of the Internet have changed the data storage and data processing modes of multimedia services. In traditional data services, enterprises must have a large number of high-performance service equipment to continuously increase the data volume. storage space and improve the performance of service data processing, but the subsequent replacement of computer hardware equipment brings high service basic costs to enterprises, and the contradiction between improving data service quality and reducing enterprise service costs is becoming more and more obvious. With the development of cloud computing, the cloud computing service mo...

AI Technical Summary

Problems solved by technology

However, the data security caused by this method is low and the cost of consumption is also large

[0006] (2) Although some cloud platforms, such as Kingsoft Express, allow users to choose to encrypt data stored in the cloud, the key is generated, distributed and managed by the cloud, so the control of the data is still in the cloud. If the cloud service Providers are not completely trusted, and user data in the cloud will be leaked

[0007] (3) Since the cloud platform is an open and multi-user environment, the cloud service provider itself cannot guarantee the data security of the cloud. If the user's data is directly stored in the cloud, it may be used by malicious programs with various There are various ways to steal and cause losses to users, such as the leakage of Internet user information such as CSDN in recent years, and the leakage of hotel customer information such as Home Inn Hanting

Patent application number CN201210116114.3), so that the ciphertext cannot be safely distributed among multiple users. Once a user obtains the decryption key, he also knows the decryption password of other users, resulting in the leakage of user data

[0009] (5) Cloud computing speeds up the transmission and use of multimedia, but once the multimedia data is decrypted, copyright protection cannot be carried out on it, and users can resell the multimedia data, resulting in the failure to protect the rights and interests of multimedia owners

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