| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To protect confidential information in a file while easily opening other information to the general, and allow a manager to recover original files. <P>SOLUTION: When a conversion instruction including a filename and conversion target character strings is inputted, a conversion part 200 determines which character is a replacement target character in the characters for each of the conversion target character strings, and then a replaced character for the replacement target character is selected from characters which do not exist in the file. Subsequently, the conversion part 200 creates a replacement map that indicates corresponding relations between replaced characters and replacement target characters, and links it to the filename to store it into a replacement map storage part 420. Then, the conversion part 200 replaces replacement target characters in conversion target character sequences with replaced characters according to the replacement map. When a reverse conversion instruction including a file name is inputted, a reverse conversion part 300 recovers replaced characters in the file to replacement target characters using the replacement map registered with the replacement map storage part 420. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
