To prevent a ciphered object from easily being deciphered by a 3rd party.

Each time respective raw materials are inputted, UMID(unique material identifier) data D11 specifying the respective raw materials are generated and the UMID data D11 corresponding to the respective raw materials are converted under mathematical conditions of a cipher key D10 to generate raw material specifying cipher keys D13 intrinsic to the respective raw materials; and mutually different data arrangement patterns (shuffling table data D14 and interleaving table data D15) corresponding to the raw materials are ciphered respectively with the raw material specifying cipher keys D13 to generate ciphered data D16 and D17 corresponding to the raw materials, thereby generating the raw material specifying cipher keys D13 which disables a 3rd party to decipher the data without knowing all of the algorithm of the cipher key D10, the conversion patterns for conversion to the raw material specifying cipher keys D13 based upon the UMID data D11 specified by the raw materials, and the UMID data D11.