Data file decryption method, decryption device and data broadcasting system

摘要

A data file decryption method, a decryption device and a data broadcasting system are disclosed, which are applied to a data broadcasting service. Among them, the data file decryption method includes the steps of: receiving the file delivery information which includes a data file identification and a key file identification corresponding to the data file; receiving the corresponding data file and key file according to the data file identification and the key file identification; and decrypting the data file according to the key file. According to the data file decryption method, decryption device and the data broadcasting system of the present invention, by setting the data file identification and the corresponding key file identification in the file delivery information and receiving the corresponding file according to the data file identification and the key file identification, the resource dissipation due to a large quantity of useless information received at a terminal is avoided, and the file to be received can be quickly located by the terminal, so that the time delay due to the decryption of a data file is avoided, and the service experience for users is improved.

主权项

1. A method for decrypting a data file, applicable in a data broadcast service and comprising:
receiving file description information comprising an identifier of a data file and an identifier of a key file corresponding to the data file; receiving the data file and the key file according to the identifier of the data file and the identifier of the key file; and decrypting the data file according to the key file; wherein if the key file comprises one key corresponding to the data file, an operation of decrypting the data file according to the key file comprises: decrypting the data file according to the key in the key file; or if the key file comprises a plurality of keys, the file description information further comprises a key identifier corresponding to the data file, and the operation of decrypting the data file according to the key file comprises: receiving the key identifier; extracting corresponding one of the keys from the key file according to the key identifier; decrypting the data file using the key; or if the key file comprises a plurality of keys, the data file comprises a key identifier corresponding to the data file, and the operation of decrypting the data file according to the key file comprises: parsing the data file to extract the key identifier therein; extracting corresponding one of the keys from the key file according to the key identifier; decrypting the data file using the key.