| 摘要 |
PROBLEM TO BE SOLVED: To prevent data from being specified as key data, even if an encipherment algorithm is deciphered by designating where the key data should be embedded at random, and to realize high speed area overlap judgment embedding of plural number of data by realizing the area overlap judgment at based on one judgment. SOLUTION: Data are prevented from being specified as key data, even if an encipherment algorithm is deciphered by randomly designating the location for key data embedding. Also, area overlap judgment based on one judgment can be realized by a buffer updating method for setting a buffer area, corresponding to an are where the data should be embedded and an area, which cannot be the leading address of the other data in the previous area as a specific value, so that a time required for overlap judgment can be reduced. |
