Method of updating broadcast sharing cipher between electronic equipment interfaces

Abstract

The invention relates to the update technology of the shared key of a group, in particular to the update method of a shared key among electronic device interfaces. The method includes three steps. Firstly, after the update cycle of the shared key is due, the transmission interface of a broadcast source device sends the shared key update message containing a new encrypted spare shared key to a receiving interface on a broadcast bus; secondly, the broadcast source device uses the spare shared key to replace the current shared key and a new spare shared key to replace the spare shared key; thirdly, the receiving interface on the broadcast bus obtains the new spare shared key by decrypting the content of the shared key update message and uses the spare shared key to replace the current sharedkey and the new spare shared key to replace the spare shared key. On the premise of the limited storing and processing capacity of the electronic device interfaces, the application of the invention can satisfy not only the requirement of the update frequency of the broadcasted shared key among the electronic device interfaces but also the requirement of the security of the transmission of the broadcasted shared key.

Description

technical field [0001] The invention relates to a group shared key update technology, in particular to a method for updating a broadcast shared key between interfaces of electronic equipment. Background technique [0002] Digital content may leak out through various digital interfaces (such as illegal recording and display) while being transferred between digital devices. In order to prevent leakage of digital content, it is necessary to carry out authentication and encryption protection on the transmission process of digital content between digital interfaces. [0003] In the terminal digital device connection network, broadcast transmission means that multiple receiving devices are connected to a broadcast source device through a bus, and digital content is sent from the sending interface of the broadcast source device to the receiving interfaces of multiple receiving devices, such as figure 1 shown. During a transmission process, the receiving interface authenticated by...

AI Technical Summary

Problems solved by technology

On the one hand, the data rate transmitted between electronic devices is generally very fast. In order to prevent the leakage of a large amount of transmitted data caused by the leakage of the shared key of the receiving interface, the broadcast shared key needs to be changed and updated frequently, and the update frequency is relatively fast; on the other hand, the broadcast source The sending interface of the device mainly completes the encrypted broadcast of digital content, and the key management function is limited, so it cannot support the above key update method; moreover, the receiving interface connected to the broadcast bus needs to update the broadcast key almost simultaneously to maintain high-speed data transmission synchronization of encryption and decryption

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