Maintaining Synchronization of Encryption Process Across Devices By Sending Frame Numbers

摘要

Maintaining synchronization of encryption processes at devices during transmission of encrypted data over a communication link is provided. Cipher link maintenance characters are sent from a source device to a sink device. A local cipher link maintenance character generated at the sink device for decrypting the encrypted data can be adjusted according to the cipher link maintenance character. After authentication, cipher link maintenance characters corresponding to units (e.g., frames) of the encrypted data are sent along with the units of the encrypted data. When a transmission error occurs during transmission of the encrypted data, cipher link maintenance characters can be used to correct the error in a local cipher link maintenance character generated at the sink device. Hence, even if the transmission error occurs in the communication link, the sink device can resolve the transmission error and maintain the synchronization of encryption processes at the source and sink devices.

主权项

1. A first apparatus (authenticated engine) for receiving multimedia data communication, comprising:
a receiving module having at least one interface coupled to a communication link, the receiving module configured to:
receive an encrypted video frame from a second apparatus via the at least one interface, andreceive a cipher link maintenance character corresponding to the encrypted video frame in a predetermined time and a bit location of a transition-minimized differential signaling (TMDS) channel of the communication link, the cipher link maintenance character representing information for verifying synchronization of an encryption of the multimedia data transmitted over the communication link with a second apparatus; and an decryption module coupled to the receiving module, the decryption module comprising a memory and a processor configured to decrypt the encrypted video frame in response to verifying based on the cipher link maintenance character that the encryption of the multimedia data is synchronized with the second apparatus.