Patent ID: 9727755
Date: 2017-08-08
CPC Classifications: G06F,H04L

Claim:
1. A method for processing information, said method comprising: dividing, by an apparatus, target information into N pieces of divided data using a secret sharing scheme in which a predetermined number (K) of pieces of the N pieces of divided data is required to restore the target information, wherein N>K, and wherein the apparatus is an information processing device that stores the N pieces of divided data; said apparatus selecting M pieces from the N pieces, wherein K>0 and K<M<N; after said selecting M pieces, said information processing device transmitting the selected M pieces to an external storage device that is external to the information processing device, said transmitting resulting in the M pieces being stored in the external storage device which limits a totality of pieces of the N pieces being stored on the external storage device to the M pieces; after said transmitting the M pieces, restoring, in the information processing device, the target information from at least K pieces of the N pieces, and after said restoring, destroying only D pieces of the M pieces in the external storage device, wherein D>M−K and D<M.