STREAM ENCRYPTION DEVICE, STREAM ENCRYPTION METHOD, STREAM DECRYPTION DEVICE, STREAM DECRYPTION METHOD

摘要

PROBLEM TO BE SOLVED: To encrypt and decrypt a stream as content at high speed.;SOLUTION: An encoder of a content transmitter encrypts the stream (content) in parallel in prescribed packet units. The encoder comprises an input data storage section (FIFO) and an output data storage section (FIFO). Between the input data storage section and the output data storage section, a plurality of encryption sections, and a group of input side data storage sections (FIFO) and a group of output side data storage sections (FIFO) corresponding to the plurality of encryption sections are prepared. The encoder performs encryption processing at high speed by successively processing data in reference block units. Similarly, an decoder of a content receiver decrypts received encryption data in packet units in parallel.;COPYRIGHT: (C)2007,JPO&INPIT