Method and system for protecting digital content

Abstract

The invention is suitable for the field of information safety and provides a method for protecting digital contents. The method comprises the following steps: a core processor of terminal equipment generates a digital signature, encrypts the digital signature and transmits the encrypted digital signature to an SP (Service Processor); the SP decrypts the digital signature, generates an SP random number, constitutes a key with an equipment identification number, a local random number and the SP random number, encrypts digital contents, and adds an encrypted information field comprising an encryption identifier and a key determining algorithm to the engaged head part of the digital contents; the SP separately transmits the digital contents to which the encrypted information field is added and the SP random number to the terminal equipment; and the core processor of the mobile equipment locally searches for a key combination which can be used for decrypting the encrypted digital contents according to the key determining algorithm, and decrypts the encrypted digital contents by adopting the key combination. According to the method and the system, the cracking difficulty of encrypted digital contents can be improved, the security of the digital contents is improved, and the aim of protecting the digital contents is fulfilled.

Description

technical field [0001] The invention belongs to the application field of digital content authorization, and in particular relates to a digital content protection method and system. Background technique [0002] With the rapid development of the Internet and electronic technology, the application of digital content as the subject matter of services is becoming more and more widespread. However, because the duplication of digital content cannot be effectively controlled, how to restrict the use of unauthorized users and protect the copyright rights of digital content providers is an important issue. The main problems of current digital content authorization certification. [0003] Common digital content includes audio and video streaming, e-books, and more. In order to maintain their copyrights, digital content providers have developed various encryption techniques and restricted applications, but none of them have achieved the expected results. [0004] At present, the main...

AI Technical Summary

Problems solved by technology

[0005] 1. Add a unique digital signature to the authorized content, and track the source of the original copy in case of infringement; the disadvantage is that it can only be traced afterwards, and cannot be blocked from the source

[0006] 2. Encrypt the use of authorized content, and bind users online so that users can only use it online; the disadvantage is that users must be online, which is not suitable for local digital content services

[0007] 3. Encrypt the authorized content and distribute it to users by controlling the method of distribution key; the disadvantage is that users deliberately share the key, and the copyright will not be protected

[0008] 4. In the functional application software, add device identification information and bind the device to be used; the disadvantage is that the software has its own identification information, and pirated users can completely track the jump information of memory instructions and crack it

[0009] 5. The encryption method of the authorized content is uniquely bound to the embedded key of the terminal device; however, when it comes to the process of disseminating the key of the user device to the outside, the disadvantage is that once the key of the user terminal is intercepted once, it can be used forever The device purchases genuine content, and after cracking the authorized content, it can be distributed illegally without restriction

[0010] There are other terminal binding methods, but most of them require each terminal to establish a terminal authorization account in the authentication center, manage the account through the authentication center, and then encrypt and publish the authorized content; the disadvantages of this authentication service center are difficult to adapt to emerge in endlessly terminal equipment development

[0011] To sum up, the existing digital content protection methods still have the problems of little difficulty in cracking and low security.

Images