Patent ID: 7818579
Filing Date: 2010-10-19
Classification: G06F,H04L

Abstract:
1. An information processor having an information dispersing function, comprising: a dividing unit for dividing a first data into n pieces of disperse information, and executing secret sharing scheme capable of restoring the first data by using arbitrary k pieces (1<k<n) of disperse information out of the n pieces of disperse information; a first storage control unit for storing the arbitrary k pieces of disperse information out of the disperse information generated by the dividing unit into plurality of recording devices; an editing unit for reconstructing the first data by using the k pieces of disperse information stored in the plurality of recording devices and editing the restored first data; a difference generating unit, after the dividing unit divides a second data which is post-edit data originated in the restored first data into n pieces of post-edit disperse information, for calculating the difference between post-edit disperse information corresponding to the recording device and pre-edit disperse information which has been stored in the recording device; and a second storage control unit for storing, for each of the recording devices, the post-edit disperse information of the recording device and the difference corresponding to the other recording devices.