发明名称 |
DATA PROCESSING SYSTEM SECURITY |
摘要 |
A first security program (Y) is initially installed in the long-term storage region (16) together with a second security program (Z). A date item (X) is also installed in another long-term storage region (15). The first security program (Y) tests whether the current date provided by a calendar (C) is the same as the installation date in item (X) and, only if true, creates a copy (X') in a region (11) of long-term storage. The copy (X') is arranged to not allow copying of itself. The security program (Y) finally deletes itself. The second security program (Z) requires absence of the program (Y) and presence of an accurate copy (X') in the region (11) before user access to the main contents of regions (15) and (16) is allowed.
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申请公布号 |
GB2195477(A) |
申请公布日期 |
1988.04.07 |
申请号 |
GB19860022572 |
申请日期 |
1986.09.19 |
申请人 |
ROGER * RUSSELL;NEIL TRACEY WIGNALL * CHARRINGTON |
发明人 |
ROGER * RUSSELL;NEIL TRACEY WIGNALL * CHARRINGTON |
分类号 |
G06F1/00;G06F9/445;G06F21/00;(IPC1-7):G06F12/14 |
主分类号 |
G06F1/00 |
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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