Data concealment method, data concealment device, and data concealment program

摘要

PROBLEM TO BE SOLVED: To partially restore concealed data.SOLUTION: A data concealing method for concealing original data S is configured to allow a computer 1 to execute steps of: dividing the original data S into predetermined processing units to generate original partial data; dividing random numbers into predetermined processing units to generate random number partial data; performing an exclusive OR operation by using the original partial data and the random number partial data to generate concealed partial data; applying a restoration ID to the concealed partial data, and storing the concealed partial data in a storage part 19; and accepting the restoration ID, and reading the concealed partial data associated with the restoration ID from the storage part 19, and restoring the corresponding original partial data by using the read concealed partial data.