INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD AND COMPUTER PROGRAM

摘要

The decoding of encrypted data is made impossible to prevent the leakage of the data. An encrypted data obtained by the encryption of processing subject data are comprised of header data (501) and many encrypting cutoff data (502). The encrypting cutoff data (502) except the last ones include information essential to decode the next encrypting cutoff data (502). In the present invention the first encrypting cutoff data (502) are destroyed at just the right time to make the decoding of the encrypted data impossible.