Abstract:
PROBLEM TO BE SOLVED: To provide a method of authenticating a terminals before a transponder transmits data to the terminal having need for communication.SOLUTION: The method is provided for authenticating the terminal for generating a magnetic field by the transponder including an oscillator for generating a voltage. In the method, at least one value decided by coupling between the transponder and the terminal is compared with at least one reference value, and the terminal is authenticated based on the comparison results. Specifically, the value of voltage generated by the oscillator corresponding to at least one value is measured, and the measured value is compared with the reference value decided by the voltage generated by the oscillator for an optimum coupling coefficient of the coupling between the transponder and the terminal.
Abstract:
PROBLEM TO BE SOLVED: To provide a device for detecting a part reduced in thickness of a substrate of an IC chip. SOLUTION: This device for detecting a part reduced in thickness of a substrate of an IC chip includes, in an active region of the substrate, a plurality of resistors connected as a Wheatstone bridge and dispersed in a rod shape; a first pair of facing resistors of the bridge are directed in a first direction; a second pair of facing resistors of the bridge are directed in a second direction; and the first and second directions are directions for changing an imbalance value of the bridge by parts of the substrate reduced in thickness. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and circuit for supervising execution of a given function or operation of an electronic circuit. SOLUTION: The method for supervising a digital signal (EN) includes the steps of: bringing a first P-channel MOS transistor (P1) into a deteriorated state of a negative bias temperature instability (NBTI) type during a period of time in which the signal to be supervised is in a first state; measuring a first amount (VMES) representing a saturation current of the first P-channel MOS transistor (P1) when switching the signal to be supervised into a second state; and giving a detection signal (DET) indicative of a supervisory result when the first amount exceeds a threshold (TH). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method which enables a transponder to authenticate a terminal before transmitting data to the terminal and enables the terminal to authenticate the transponder before transmitting data to the transponder.SOLUTION: In a method of authentication, by a terminal generating a magnetic field, of a transponder located in this field, the terminal transmits to the transponder first data relative to a current in an oscillating circuit of the terminal, which is measured by the terminal for a first value of a resistive load of the transponder, and the transponder calculates second data relative to the current of the oscillating circuit of the terminal for a second value of the resistive load and transmits the calculated second data to the terminal, and the terminal compares the transmitted second data with third data relative to the current of the oscillating circuit of the terminal, which is measured by the terminal for the second value of the resistive load, and the terminal authenticates the transponder on the basis of the comparison result.
Abstract:
PROBLEM TO BE SOLVED: To accelerate a communication rate in a single-wire protocol, by providing a method and system relating to data transmission between two devices via a single-wire connection part. SOLUTION: The present invention relates to a method of determining, by a first device capable of transmitting a two-state signal over a single-wire connection part to a second device, the binary state of data transmitted from the second device to the first device over the connection part, with the state being determined according to the slope of a rising edge of the two-state signal. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a device for protecting an integrated circuit against an laser attack, enabling protection of the major portion of the integrated circuit without significantly extending the surface area of the integrated circuit. SOLUTION: The integrated circuit includes a substrate of a semiconductor material, active areas formed on a first surface side of the substrate, and a protection device against laser attacks. The protection device includes at least one first doped region formed between the active area and a second surface side of the substrate, a biasing device for biasing the first doped region, and a detection device for detecting durable increase in a current provided by the biasing device. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for detecting a fault utilizing attack. SOLUTION: The method for detecting a fault utilizing attack includes: providing a plurality of blinding values; generating a first set including a first group of data elements and at least one additional data element generated by performing the exclusive OR between at least one data element in the first group and at least one of the blinding values; generating a second set comprising data elements corresponding to the exclusive OR between each data element of the first set and a selected one of the plurality of blinding values; generating a first signature by performing a commutative operation among the respective data elements of the first set; generating a second signature by performing the commutative operation between the respective data elements of the second set; and comparing the first signature with the second signature to detect a fault utilizing attack. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of allowing transponders to authenticate terminals before transmission of data to the terminals, and of allowing the terminals to authenticate transponders before transmission of data to the transponders.SOLUTION: By the method of allowing the transponder including an oscillator for generating a voltage to authenticate the terminal for generating a magnetic field, the transponder receives first data for current of the oscillator of the terminal measured by the terminal for a first value of a resistive load of the transponder, the transponder each measures a voltage generated by the oscillator for the first value of the resistive load and a second value of the resistive load, and the transponder uses second data for the measured voltage and the first received data to authenticate the terminal.
Abstract:
PROBLEM TO BE SOLVED: To provide a method capable of evaluating the capacity of a transponder in order to perform processing according to power extracted from a magnetic field generated by a terminal.SOLUTION: The method for evaluating power enabled to be extracted from the magnetic field of the terminal by the electromagnetic transponder existing in the magnetic field of the terminal generating the magnetic field includes: a step for evaluating a coupling coefficient between the transponder and the terminal; and a step for inferring usable power on a position where the coupling coefficient is evaluated based on the evaluated coupling coefficient.
Abstract:
PROBLEM TO BE SOLVED: To provide a method capable of evaluating a coupling coefficient between a transponder and a terminal in a magnetic field of the terminal, in which the transponder exists.SOLUTION: In the method for evaluating the coupling coefficient between the electromagnetic transponder and the terminal, a ratio of voltages of an oscillation circuit in the transponder obtained as to two values of resistive loads of the transponder is compared with one or more thresholds, and the coupling coefficient is evaluated based on the compared result. Further, a DC voltage applied by a rectifier connected between both ends of the oscillation circuit is measured respectively as to two values of the resistive loads.