公开(公告)号：US20060095791A1

公开(公告)日：2006-05-04

申请号：US10979691

申请日：2004-11-01

申请人： Daniel ManHung Wong

发明人： Daniel ManHung Wong

IPC分类号： G06F12/14

CPC分类号： G06F21/64 ,  G06F21/6227 ,  G06F2221/2101

摘要： One embodiment of the present invention provides a system that protects data from unauthorized modification in a table, wherein the table contains one or more rows, and wherein each row contains one or more columns. During operation, the system chooses in a row one or more columns to be protected. The system then produces an encrypted value for the row based on the data stored in the chosen columns. Next, the system stores the encrypted value in a column which cannot be easily modified. In this way, a later-produced encrypted value generated from the values in the protected columns can be compared against the previously stored encrypted value to verify the integrity of the data stored in the protected columns.