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    • 9. 发明申请
    • CIRCUIT PROTECTION SYSTEM AND METHOD
    • US20170228562A1
    • 2017-08-10
    • US15501480
    • 2015-07-30
    • SECURE-IC SAS
    • Sylvain GUILLEYThibaut PORTEBOEUFJean-Luc DANGER
    • G06F21/75G06F11/263
    • G06F21/75G06F11/22G06F11/263G06F21/55G06F21/56G06F21/71G06F2221/034G09C1/00H04L9/002H04L2209/046H04L2209/12
    • The invention proposes a method of protection of a Boolean circuit associated with a structural description of the circuit comprising elementary Boolean variables, each represented by one bit, the method comprising the steps consisting in: selecting a set of k elementary Boolean variables of the circuit as a function of predefined selection criteria, constructing a variable x represented by k bits by concatenation of the k selected variables in accordance with a chosen order, determining a binary code C comprising a set of code words and belonging to a given vector space and the supplementary code D of said binary code C as a function of a condition bearing on the dual distance of said supplementary code D, said binary code C having a length n and a size 2k, where k designates the number of bits representing said variable x; substituting the variable x in the structural description of the Boolean circuit with a protected variable z represented by n bits so that: any operation of writing on the variable x in the circuit is substituted with an operation of writing on the variable z, the variable z being generated by adding the variable x encoded by said code C to a random bit vector y encoded by the supplementary code D, and any operation of reading the variable x in the circuit is substituted with an operation of reading the value of the protected variable z and an operation of decoding said read value of the protected variable z using a decoding matrix J of size (n×k) determined from the binary code C and the supplementary code D of the binary code C.