Proton World International N.v.

Stmicroelectronics (rousset) Sas

Stmicroelectronics S.r.l.

Centre National De La Recherche Scientifique

Université Libre De Bruxelles

Gilles Van Assche

Joan Daemen

Jean-Louis Modave

Ronny Van Keer

Fabrice Marinet

Guido Marco Bertoni

Pierre-Yvan Liardet

Frank Cuypers

Jérôme Charles Wenger

Nicolas Cerf

Philippe Grangier

Rosa Brouri-Tualle

Frédéric Grosshans

Ronny Vankeer

A method encrypts, using an encryption circuit, a first data value having a number n of first binary words, each word having a number m of bits. The encrypting includes generating a second data value having a same number n of second binary words of m bits each and outputting a result of the encryption. The number n is an integer greater than or equal to 3, m and n do not have a common integer division, and n or m is even. A second binary word of the second data value having a rank i is equal to a sum of: a first binary word having a same rank i; and a product of: a complement of a first binary word having rank ((i+1)modulo n), shifted by a first number of bit positions; and a first binary word having rank ((i+2)modulo n), shifted by a second number of bit positions.

Data values encryption method

The disclosure concerns a method implemented by a processing device. The method includes performing a first execution by the processing device of a computing function based on one or more initial parameters stored in a first memory device. The execution of the computing function generates one or more modified values of at least one of the initial parameters, wherein during the first execution the one or more initial parameters are read from the first memory device and the one or more modified values are stored in a second memory device. The method also includes performing a second execution by the processing device of the computing function based on the one or more initial parameters stored in the first memory device.

Method and device for fault detection

A method for writing data into a reprogrammable non-volatile memory, wherein a marking pattern including several bits is added at the beginning of the data and the set formed of the marking pattern and of the data is written from an address in the memory varying from one write operation to another, the marking pattern being identical for each write operation.

Method for writing into and reading from an atomicity memory using marking pattern

A method for checking the integrity of a program executed by an electronic circuit and including at least one conditional jump, wherein: a first value is updated for any instruction which does not correspond to a jump instruction; a second value is updated with the first value for each conditional jump instruction; and the second value is compared with a third value, calculated according to the performed conditional jumps.

Checking the integrity of a program executed by an electronic circuit

A method of performing a cryptographic operation including: receiving a plurality of binary input values; splitting the binary input values into a plurality of non-binary digits of base r, where r is an integer greater than 2 and not equal to a power of 2; and performing, by a cryptographic block on each of the plurality of non-binary digits, a different modulo r operation to generate at least one output digit) of base r.

Method and circuit for cryptographic operation

A method for protecting a generation, by an electronic circuit, of at least one prime number by testing the prime character of successive candidate numbers, including: for each candidate number: the calculation of a reference number involving at least one first random number, and at least one primality test based on modular exponentiation calculations; and for a candidate number having successfully passed the primality test: a test of consistency between the candidate number and its reference number.

Protection of a prime number generation for an RSA algorithm

A counting method and a counter using an integrated circuit memory area, including at least one step of storage of partial values in several words of identical memory sizes, the result of the counting being obtained by arithmetically adding the values contained in the different words.

Event counter

A method and an element for ciphering with an integrated processor data to be stored in a memory, including applying to each data block to be ciphered a ciphering algorithm which is a function of at least one key specific to the integrated circuit, and before applying the ciphering algorithm thereto, combining the data block to be ciphered with the result of a function of the storage address of the ciphered block in the memory, and/or of combining the key with the result of a function of the storage address of the ciphered block in the memory and of a digital quantity different from the ciphering key.

Ciphering by blocks of the content of a memory external to a processor

A method and a system for checking the atomic character of at least one command executed by a microprocessor of an electronic component including at least one rewritable non-volatile memory, including: selecting a command including at least one updating of at least one piece of data in the non-volatile memory; executing this command several times; interrupting each execution at a different time of its development; and checking, after each interrupt, the coherence of the data in the non-volatile memory with respect to at least one predetermined authorized state.

Checking of the atomicity of commands executed by a microprocessor

One aspect of the present invention is related to a quantum cryptographic scheme comprising at least one sending unit including a physical means of encoding and distributing a raw key in the quadrature components of quantum coherent states that are continuously modulated in phase and amplitude, at least one receiving unit containing a physical means of performing homodyne detection of the quantum coherent states in order to measure the quadrature components of the states, a quantum channel for connecting the sending unit to the receiving unit, a two-way authenticated public channel for transmitting non-secret messages between the sending unit and the receiving unit, a quantum key distribution protocol ensuring that the information tapped by a potential eavesdropper can be estimated from the quantum channel parameters, and a direct or reverse reconciliation protocol that converts the raw continuous data into a common binary key.

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Brussels, Belgium

Gilles Van Assche