发明名称 |
Transistor integrated circuit protected against the analysis, and a card comprising such a circuit |
摘要 |
A transistor integrated circuit particularly for use in transaction cards such as credit cards or payment cards comprises conductive film zones on the surface of the circuit having a shape and layout which makes it difficult or impossible to determine the layout of the circuit. Additional metal zones may be formed at the level or below the level of the transistor connection strips, which cannot be eliminated without eliminating the strips. Alternatively, instead of strips, metal zones extended in two dimensions are used whereby their junction to an underlying transistor may not be easily located by observing their surface by microscopic means.
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申请公布号 |
US4434361(A) |
申请公布日期 |
1984.02.28 |
申请号 |
US19800211968 |
申请日期 |
1980.12.01 |
申请人 |
ELECTRONIQUE MARCEL DASSAULT |
发明人 |
MEINGUSS, ALAIN;DESPRES, BERNARD |
分类号 |
G06K19/077;H01L23/58;(IPC1-7):G06K7/06 |
主分类号 |
G06K19/077 |
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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