1. A pipeline processing system applying pipeline processing for a plurality of data, comprising: a plurality of processing circuits configuring pipeline stages and applying predetermined processings to said plurality of data; a memory portion including at least one memory able to store data having a magnitude required in at least one pipeline stage and accessed by any processing circuit of said plurality of processing circuits; and an encrypting circuit for encrypting data based on information set for each series of pipeline processing to be continuously processed when the processing results of said processing circuits are stored in the memories of said memory portion.