Content data, transmitting apparatus, receiving apparatus and decoding method

摘要

A transmitting apparatus comprises an initialization vector generating unit for generating an initialization vector, an encryption unit for initializing a stream encryption module using the generated initialization vector and performing stream encryption on stream data using the initialized stream encryption module, an encryption packet generating unit for generating an encryption packet containing encrypted stream-encrypted data, an initialization packet generating unit for generating an initialization packet containing an initialization vector and time information indicating when a next initialization vector subsequent to the initialization vector will be sent, and a transmission unit for transmitting the initialization packet and the encryption packet by broadcast/multicast.

主权项

1. A transmitting apparatus comprising:
an initialization vector generating circuit configured to generate an initialization vector for encrypting stream data with a stream encryption method; an encryption circuit configured to initialize a stream encryption module using the initialization vector generated by the initialization vector generating circuit, and performing stream encryption on the stream data using the stream encryption module initialized; an encryption packet generating circuit configured to generate an encryption packet containing stream-encrypted data encrypted by the encryption circuit; an initialization packet generating circuit configured to generate an initialization packet containing the initialization vector, the initialization packet containing the initialization vector further containing time information indicating when a next initialization vector subsequent to the initialization vector will be sent; and a transmitter configured to transmit the initialization packet and the encryption packet by broadcast/multicast.