| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an encryption and decryption system suitable for encrypting and sharing information, apparatuses and methods for encryption and decryption thereof, and programs to realize them on a computer. <P>SOLUTION: The encryption apparatus 101 receives an input file in an input part 102, and then encrypts it in an encryption part 103. History information included in the encrypted file is encrypted in a history information encryption part 104. The file encrypted in the encryption part 103 and the history information encrypted in the history information encryption part 104 are together output from an output part 105 as an output file of the encryption apparatus 101. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
