CONCEALMENT METHOD FOR CONCEALMENT TARGET INFORMATION, CONCEALMENT TARGET INFORMATION CONCEALMENT DEVICE, PROGRAM, EXTRACTION METHOD FOR CONCEALMENT TARGET INFORMATION, AND CONCEALMENT TARGET INFORMATION EXTRACTION DEVICE

摘要

PROBLEM TO BE SOLVED: To appropriately protect concealment target information by using a two-dimensional code.SOLUTION: The concealment method of concealment target information using a first two-dimensional code including at least first non-public information and a second two-dimensional code including at least second non-public information includes: generating the first two-dimensional code including data information for protective encoding for specifying data for protective encoding for performing the protective encoding of the second two-dimensional code in the first non-public information; and generating the second two-dimensional code after protective encoding by applying the data for protective encoding to at least a part of the second two-dimensional code including the concealment target information in the second non-public information.