发明名称 |
Security circuit and method to secure information in a device |
摘要 |
A circuit and method for securing information (e.g., a product serial number or certification key) stored in non-volatile on-chip memory from unauthorized read-out or destruction. External access is prevented by writing a first n-bit security key-word into the memory. A compare circuit compares the first security key-word with a second n-bit security key-word and outputs a comparison signal that either grants or denies external access to the memory based on a predetermined compare condition. The values of each of the first and second key-word and the comparison algorithm (predetermined compare condition) may be selected to avoid any interference with external memory-testing. The predetermined compare condition may be a pre-selected one of a match and a mismatch between the first security key word and the second security key word. At least one bit of the first or second security key word may be a fuse programmable bit.
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申请公布号 |
US2006184799(A1) |
申请公布日期 |
2006.08.17 |
申请号 |
US20050238576 |
申请日期 |
2005.09.29 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
SEO YOON-BUM;KONG MYOUNG-SEOK;MIN BYUNG-HO |
分类号 |
H04L9/00 |
主分类号 |
H04L9/00 |
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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