CONFIDENTIAL INFORMATION HIDING DEVICE, CONFIDENTIAL INFORMATION RESTORING DEVICE, CONFIDENTIAL INFORMATION HIDING PROGRAM, AND CONFIDENTIAL INFORMATION RESTORING PROGRAM

摘要

PROBLEM TO BE SOLVED: To hide data incapable of morphing in cover data as confidential data using steganography based on morphing, and hide the confidential data with respect to a plurality of cover data items or simultaneously hide the plurality of confidential data items in the cover data items the number of which is less than the confidential data items.SOLUTION: The steganography technique generates a stegoobject s by causing cover data c to hide confidential data m. Calculation means 15 generates the stegoobject that hides the confidential data in the reference data or restores the confidential data from the stegoobject by applying morphing technique for generating morphing data, on the basis of reference data, feature vector of each item of the reference data, a degree of contribution in each reference data item, and confidential data.