Patents by Inventor Afshin Rezayee

Afshin Rezayee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190102759
    Abstract: A payment terminal has a clock management unit for providing clock signals to components of the payment terminal. The payment terminal also has a wireless communication interface for communicating wireless signals. A processing unit of the payment terminal may monitor clock signals provided by the clock management unit and determine a phase and frequency difference between a clock signal provided to a component producing RF noise and a clock signal provided to a wireless communication interface of the payment terminal. When RF noise present in the received wireless signal falls below a threshold, the processing unit may sample the received wireless signal.
    Type: Application
    Filed: September 30, 2017
    Publication date: April 4, 2019
    Applicant: Square, Inc.
    Inventors: Jeremy Wade, Afshin Rezayee
  • Publication number: 20190103925
    Abstract: A payment terminal has a clock management unit for providing clock signals to components of the payment terminal. The payment terminal also has a wireless communication interface for communicating wireless signals. A processing unit of the payment terminal may monitor operation of a wireless communication interface of the payment terminal and, when the payment terminal is communicating wirelessly, modify an initial clock signal provided to one or more components of the payment terminal that emit RF noise to modify a frequency at which the RF noise occurs. When the payment terminal is no longer transmitting, the processing unit may provide the initial clock signal to the RF noise source.
    Type: Application
    Filed: September 30, 2017
    Publication date: April 4, 2019
    Applicant: Square, Inc.
    Inventors: Jeremy Wade, Afshin Rezayee
  • Publication number: 20190102760
    Abstract: A payment terminal has a clock management unit for providing clock signals to components of the payment terminal. The payment terminal also has a wireless communication interface for communicating wireless signals. A processing unit of the payment terminal may monitor clock signals provided by the clock management unit and determine a phase and frequency difference between a clock signal provided to a component producing RF noise and a clock signal provided to a wireless communication interface of the payment terminal. When RF noise present in the received wireless signal falls below a threshold, the processing unit may sample the received wireless signal.
    Type: Application
    Filed: September 30, 2017
    Publication date: April 4, 2019
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Mary Kay Bowman, Christopher Rohlf
  • Patent number: 10235667
    Abstract: A payment terminal can have an application processing unit coupled to a transaction processing unit. The transaction processing unit can receive payment information from a payment device via a payment interface coupled to the transaction processing unit. The transaction processing unit can encrypt the payment information in accordance with a standard payment protocol and provide the encrypted payment information and other protocol dependent information to the application processing unit. The application processing unit can execute a point-of-sale application that can have the transaction processing unit acquire the payment information and have the application processing unit transmit the encrypted payment information and other protocol-dependent information from the transaction processing unit to a payment server.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: March 19, 2019
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Yue Yang, Jesse Wilson, Kevin Ng
  • Patent number: 10198727
    Abstract: A communication device has a processing unit, a transmit circuit, and an antenna. The processing unit generates a carrier signal and modifies the carrier signal based on a notch modulation procedure having notch delay and a notch width. The notch width is selected based on a desired modulation index. The resulting modulation signal is provided to the transmit circuit, which generates a wireless data signal that is transmitted by the antenna.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: February 5, 2019
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Jason Binder, Emad Bidari
  • Publication number: 20190026724
    Abstract: An electronic device may include a printed circuit board having a physically unclonable function (PUF) source. The electronic device may also include an integrated circuit (IC) chip positioned on the printed circuit board, and the first PUF source may be embedded in or formed on the printed circuit board external to the IC chip. The IC chip has processing circuitry that is configured to determine PUF data based on the PUF source. The processing circuitry is further configured to determine a cryptographic key or authentication token based on the PUF data and to perform at least one secure operation using the cryptographic key or authentication token.
    Type: Application
    Filed: March 30, 2018
    Publication date: January 24, 2019
    Applicant: Square, Inc.
    Inventors: Jeremy Wade, William Hardy, Malcolm Ronald Smith, Afshin Rezayee, Yue Yang
  • Publication number: 20190028284
    Abstract: A device may include a physically unclonable function (PUF) source that has at least one fuse embedded in the device. The PUF source may be responsive to an input for transmitting a signal through the fuse and providing a PUF value based on a measurement of such signal. The device also has circuitry that is configured to modify the fuse by transmitting a signal of sufficiently high current or voltage through the fuse to change its resistance, thereby changing a response of the PUF source to the input.
    Type: Application
    Filed: March 30, 2018
    Publication date: January 24, 2019
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Yue Yang, Malcolm Ronald Smith
  • Publication number: 20190028283
    Abstract: A device may include one or more sources such as circuit elements and electrical components that function as sources for physically unclonable function (PUF) data. PUF data may be acquired from the PUF sources and one or more error correction codes may be applied to the PUF data. The resulting PUF values may be used to generate information that may be used for device security operations such as encryption and tamper detection.
    Type: Application
    Filed: January 31, 2018
    Publication date: January 24, 2019
    Inventors: Kamran Sharifi, Afshin Rezayee, Jeremy Wade, Yue Yang, Max Joseph Guise, Bertram Leesti
  • Publication number: 20190028282
    Abstract: A device may include one or more sources such as circuit elements and electrical components that function as sources for physically unclonable function (PUF) data. PUF data may be acquired from the PUF sources and one or more error correction codes may be applied to the PUF data. The resulting PUF values may be used to generate information that may be used for device security operations such as encryption and tamper detection.
    Type: Application
    Filed: December 15, 2017
    Publication date: January 24, 2019
    Inventors: Kamran Sharifi, Afshin Rezayee, Jeremy Wade, Yue Yang, Max Joseph Guise, Bertram Leesti
  • Patent number: 10175118
    Abstract: A payment reader includes an anti-tamper circuit for comparing a voltage measured from a temperature sensing circuit with a voltage from one or more threshold nodes. A voltage of a measurement node of the temperature sensing circuit and of each threshold node may correspond to a temperature. A temperature comparison circuit may determine whether a pre-determined temperature threshold has been breached on a comparison of a voltage of the measurement node of the temperature sensing circuit with voltages corresponding to the one or more temperature thresholds. A tamper attempt may be detected if the voltage measured from the temperature sensing circuit exceeds a high voltage threshold or falls below a low voltage threshold. The temperature comparison circuit may provide an output to anti-tamper circuit indicating a result of the comparison.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: January 8, 2019
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Ravi Shivnaraine, Alain Rousson, Yue Yang, Kajornsak Julavittayanukool
  • Publication number: 20180374074
    Abstract: A payment terminal can have an application processing unit coupled to a transaction processing unit. The transaction processing unit can receive payment information from a payment device via a payment interface coupled to the transaction processing unit. The transaction processing unit can encrypt the payment information in accordance with a standard payment protocol and provide the encrypted payment information and other protocol dependent information to the application processing unit. The application processing unit can execute a point-of-sale application that can have the transaction processing unit acquire the payment information and have the application processing unit transmit the encrypted payment information and other protocol-dependent information from the transaction processing unit to a payment server.
    Type: Application
    Filed: September 3, 2018
    Publication date: December 27, 2018
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Yue Yang, Jesse Wilson, Kevin Ng
  • Publication number: 20180315038
    Abstract: A device may run an application having information with multiple accounts associated with processing of transactions. The application may provide account information that is used to process the transactions. At the same time, a background application may operate on the device. The background application may be compatible with a second device, and when within range of the second device, may communicate background messages relevant to the transaction. The transaction may then be processed based on the account information and the background messages.
    Type: Application
    Filed: April 28, 2017
    Publication date: November 1, 2018
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Malcolm Smith, Lev Kusman, Gokhan Aydeniz, Yasser Zabuair, Jesse Wilson, Shawn Zurbrigg, Murat Cat
  • Patent number: 10068223
    Abstract: A payment terminal can have an application processing unit coupled to a transaction processing unit. The transaction processing unit can receive payment information from a payment device via a payment interface coupled to the transaction processing unit. The transaction processing unit can encrypt the payment information in accordance with a standard payment protocol and provide the encrypted payment information and other protocol dependent information to the application processing unit. The application processing unit can execute a point-of-sale application that can have the transaction processing unit acquire the payment information and have the application processing unit transmit the encrypted payment information and other protocol-dependent information from the transaction processing unit to a payment server.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: September 4, 2018
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Yue Yang, Jesse Wilson, Kevin Ng
  • Publication number: 20180247084
    Abstract: Processor system with a general purpose processor and a cryptographic processor dedicated to performing cryptographic operations and enforcing the security of critical security parameters. The cryptographic processor prevents exposure of critical security parameters outside the cryptographic processor itself, and instead implements a limited scripting engine, which can be used by the general purpose processor to execute operations that require the critical security parameters.
    Type: Application
    Filed: December 29, 2017
    Publication date: August 30, 2018
    Applicant: Square, Inc.
    Inventors: Malcolm Ronald Smith, Kshitiz Vadera, Mark Phillip Zagrodney, Kevin Ka Wai Ng, Afshin Rezayee
  • Publication number: 20180240103
    Abstract: A payment processing device can implement a monitoring system to detect for tamper attempts at a physical interface such as a chip card interface. The monitoring system can establish local tamper criteria including a baseline when no chip card is present in the chip card interface, or in some embodiments, when it is known that an authentic chip card is present in the slot. During subsequent evaluations of the chip card interface by the monitoring system, a response received by the monitoring system that deviates from the local test criteria can indicate that a tamper attempt at the chip card interface may have occurred. The payment processing device may also communicate test results to a server for further testing, or for an update of the local test criteria.
    Type: Application
    Filed: February 22, 2017
    Publication date: August 23, 2018
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Malcolm Smith, Yue Yang, Jeremy Wade, Max Guise, Kamran Sharifi
  • Publication number: 20180240117
    Abstract: A payment processing device can implement a monitoring system to detect for tamper attempts at a chip card interface. The monitoring system can establish a baseline when no chip card is present in the chip card interface, or in some embodiments, when it is known that an authentic chip card 14 is present in the slot 21. During subsequent evaluations of the chip card interface by the monitoring system, a response received by the monitoring system that deviates from the baseline can indicate that a tamper attempt at the chip card interface may have occurred. If a tamper attempt is determined by the monitoring system, a remedial or corrective action can be taken.
    Type: Application
    Filed: February 22, 2017
    Publication date: August 23, 2018
    Applicant: Square, Inc.
    Inventors: Afshin Rezayee, Malcolm Smith, Yue Yang, Jeremy Wade, Max Guise, Kamran Sharifi
  • Patent number: 9959536
    Abstract: A comparator can incorporate a hysteresis circuit to control when the output of the comparator changes between a high voltage signal and a low voltage signal. The comparator can receive a differential signal and can output either the high voltage signal or the low voltage signal. When the differential input signal is above a first threshold voltage, the output of the comparator can transition to the high voltage signal and when the differential input signal is below a second threshold voltage, the output of the comparator can transition to the low voltage signal. The hysteresis circuit of the comparator is used to adjust the first threshold voltage and the second threshold voltage required to transition the output of the comparator based on the present state of the output signal of the comparator.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: May 1, 2018
    Assignee: Square, Inc.
    Inventors: Ravi Shivnaraine, Yue Yang, Alain Rousson, Kajornsak Julavittayanukool, Afshin Rezayee
  • Patent number: 9941884
    Abstract: A level shifting circuit can be used to adjust the level of the input signal to a desired output level while maintaining the duty cycle of the input signal. The level shifting circuit can include a capacitor to AC couple the input signal to an inverter that is self-biased at the threshold voltage for the inverter. The AC coupling of the input signal permits the input signal to “ride on” the threshold voltage and transition the inverter between states depending on the value of the input signal. The inverter can be biased at the threshold voltage by connecting the output of the inverter in feedback with the input of the inverter using one or more resistors.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: April 10, 2018
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Ravi Shivnaraine, Alain Rousson, Yue Yang, Kajornsak Julavittayanukool
  • Publication number: 20180096341
    Abstract: A payment reader includes a tuning circuit that provides a tuned transmission source signal to an antenna for transmission. A sense circuit coupled to the antenna provides a measured transmitted signal to a binary phase detection circuit. The binary phase detection circuit filters and processes the signal to provide an analog phase signal that corresponds to a phase difference between the measured transmitted signal and the transmission source signal. A comparison circuit compares the analog phase signal to a reference signal, and a decision circuit adjusts the operation of the transmission circuitry based on the comparison.
    Type: Application
    Filed: October 3, 2016
    Publication date: April 5, 2018
    Applicant: Square, Inc.
    Inventors: Ravi Shivnaraine, Emad Bidari, Alain Rousson, Yue Yang, Kajornsak Julavittayanukool, Afshin Rezayee
  • Patent number: 9917577
    Abstract: A brown-out detector and power-on-reset circuit can be used to monitor a supply voltage to determine when brown-out and power-on events occur and provide the appropriate reset signal in response. The circuit can include a comparator to generate the reset signal and a first monitoring circuit that operates in conjunction with a second monitoring circuit to provide an input voltage to the comparator. The first monitoring circuit can incorporate a bandgap circuit and can be used to control the input voltage based on the comparison of the supply voltage and a corresponding supply voltage threshold. The second monitoring circuit can incorporate a diode and can be used when the supply voltage is lower than a threshold voltage for the bandgap circuit. The second monitoring circuit can be used to control the input voltage based on a comparison of the supply voltage and a threshold voltage for the diode.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: March 13, 2018
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Ravi Shivnaraine, Alain Rousson, Yue Yang, Kajornsak Julavittayanukool