Security device for a semiconductor chip
First Claim
1. Security device for preventing access to confidential information stored in a semiconductor chip ("protected chip"), comprising:
- a second semiconductor chip ("protective chip"), said protected and protective chips facing each other and being coupled to each other by communication terminals, the protected chip being coupled to external circuits via said protective chip, and wherein said chips have therebetween a semiconductor resin having a nonhomogeneous electrical resistivity, said protective chip including means for measuring a plurality of resistances through the semiconductor resin, and means for determining, at least from the measured resistances, an encryption key communicated to the protected chip, which key protect the confidential information.
5 Assignments
0 Petitions
Accused Products
Abstract
Security device for preventing access to confidential information stored in a semiconductor chip, or protected chip. The security device comprises a second semiconductor chip, or protective chip, with the two chips facing each other and being coupled to each other by communication terminals. The protected chip is coupled to external circuits via the protective chip, and the two semiconductor chips are separated by a semiconductor resin having a non-homogeneous electrical resistivity. The protective chip is provided with means for measuring a plurality of resistances through the semiconductor resin and with means for determining, at least from the measured resistances, an encryption key intended to be communicated to the protect chip to protect the confidential information.
38 Citations
23 Claims
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1. Security device for preventing access to confidential information stored in a semiconductor chip ("protected chip"), comprising:
- a second semiconductor chip ("protective chip"), said protected and protective chips facing each other and being coupled to each other by communication terminals, the protected chip being coupled to external circuits via said protective chip, and wherein said chips have therebetween a semiconductor resin having a nonhomogeneous electrical resistivity, said protective chip including means for measuring a plurality of resistances through the semiconductor resin, and means for determining, at least from the measured resistances, an encryption key communicated to the protected chip, which key protect the confidential information.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
Specification