发明名称 |
Database management apparatus and encrypting/decrypting system |
摘要 |
<p>In a database, a frequently retrieved column is encrypted using a common key, and other columns are encrypted using a specific row key. Thus, a retrieving process can be performed at a high speed, and the security can be improved. Then, the row and column of the database are encrypted by assuming the plaintext to be encrypted as a bit string, and performing a binary operation with a random bit string. A random bit string is obtained by sequentially generating multidimensional vectors using a nonlinear function by defining a predetermined bit length as 1 word and a plurality of words as components of the multidimensional vector.</p> |
申请公布号 |
EP1089194(B1) |
申请公布日期 |
2013.05.08 |
申请号 |
EP20000121136 |
申请日期 |
2000.09.28 |
申请人 |
CASIO COMPUTER CO., LTD. |
发明人 |
SATO, MAKOTO;TAKEDA, TSUNEHARU;MORI, JUNJI;KUROSAWA, KAZUO |
分类号 |
G06F17/40;G06F21/00;G06F12/00;G06F17/30;G06F21/62 |
主分类号 |
G06F17/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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