摘要:
A master-slave D type flip-flop circuit includes a power consumption masking circuit including a reference stage in parallel with a master and a slave stage of the flip-flop circuit. This structure advantageously provides a switching of the flip-flop circuit on each of the leading and trailing edges of the clock signal for the sequencing of the flip-flop circuit.
摘要:
A modular arithmetic coprocessor comprises a circuit for the computation of an error correction parameter H=2x mod N associated with the Montgomery method. This computation circuit comprises a first register, a second register, and a first circuit for the series subtraction of either zero, N, twice N, or three times N from the contents of the first register. A multiplication circuit carries out a multiplication by four. A second circuit compares the result with N, twice N or three times N.
摘要:
A sequential access memory working at the rate of a clock signal CK includes N register elements N, each storing an information bit. These register elements are divided into L groups, each comprising P elements that are series-connected and simultaneously activated or not activated (with P.times.L=N). The register elements of a given group are activated at least P times consecutively during a part of the time, and are not activated for the rest of the time. Accordingly, each group stores P consecutive information bits each from among the N bits arriving in serial form at the input of the memory. The advantage of the memory is that it enables a reduction in the dynamic energy consumption.
摘要:
The invention relates to an electronic circuit for interconnecting a smartcard chip with a peripheral device, comprising: —a dedicated communication interface adapted to communicate with a smartcard chip; —a configurable communication interface adapted to communicate with a peripheral device; —a configuration module adapted to receive on said dedicated communication interface a request for configuring the configurable communication interface, adapted to configure the communication protocol of the configurable communication interface with the peripheral device based on the received request; —a bridging module adapted for converting data exchanged between the peripheral device and the smartcard chip through the dedicated communication interface and the configurable communication interface.
摘要:
A bridge circuit 10 is provided between first data port A1, A2 and second data port B1, B2. The bridge circuit comprises a first transceiver stage 40 comprising at least one input buffer 11, 14 and at least one tri-state output buffer 12, 13 linked to the first data port, a second transceiver stage 50 comprising at least one input buffer 21, 24 and at least one tri-state output buffer 12, 13 linked to the second data port, a first detection circuit 31 for detecting the arrival of a packet by the first data port, a second detection circuit 37 for detecting the arrival of a packet by the second data port. A selection circuitry 34, 35 enables the output of tri-state output buffer of the first or of the second transceiver stage depending of the detection made by the first and second detection circuits.
摘要:
The invention relates to an electronic circuit (3) for interconnecting a smartcard chip with a peripheral device, comprising:—a dedicated communication interface (31) adapted to communicate with a smartcard chip;—a configurable communication interface (33,34,35) adapted to communicate with a peripheral device;—a configuration module (32) adapted to receive on said dedicated communication interface a request for configuring the configurable communication interface, adapted to configure the communication protocol of the configurable communication interface with the peripheral device based on the received request;—a bridging module (32) adapted for converting data exchanged between the peripheral device and the smartcard chip through the dedicated communication interface and the configurable communication interface.
摘要:
A method for generating a random number, comprising steps of receiving a data transmission binary signal subjected to phase jitter, generating several oscillator signals substantially of a same average frequency and having distinct respective phases, sampling a status of each of the oscillator signals upon the appearance of edges of the binary signal, and of generating a random number using the statuses of each of the oscillator signals. The method may be applied to an integrated circuit usable in a smart card.
摘要:
A method for generating a random number, comprising steps of receiving a data transmission binary signal subjected to phase jitter, generating several oscillator signals substantially of a same average frequency and having distinct respective phases, sampling a status of each of the oscillator signals upon the appearance of edges of the binary signal, and of generating a random number using the statuses of each of the oscillator signals. The method may be applied to an integrated circuit usable in a smart card.
摘要:
In an electronic component including a two-way bus through which data elements travel between peripherals and a central processing unit at the rate of a clock signal, the central processing unit and at least one of the peripherals each includes a data encryption/decryption cell. Each data encryption/decryption cell uses the same secret key. The secret key is produced locally at each clock cycle in each cell from a random signal synchronous with the clock signal, and is applied to each of the cells by a one-way transmission line.
摘要:
A device includes a serial port for connecting as a slave to a master device through a serial link. The device further includes a detection circuit for detecting the presence of an impedance of the master device, linked to a terminal of the serial port. The device can be used with microprocessor cards comprising a USB port.