Patents by Inventor Joachim Trescher

Joachim Trescher 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).

  • Implementing padding in a white-box implementation
    Patent number: 9665699
    Abstract: A non-transitory machine-readable storage medium encoded with instructions for execution by a keyed encryption operation by a cryptographic system mapping an input message having an encoded portion and a padding portion to an output message, including: instructions for receiving a padding value k; instructions for receiving the input message, wherein the padding portion has a size indicated by the padding value k; instructions for computing a first portion of the encryption operation to produce a first portion output; instructions for computing a compensation factor corresponding to the padding portion of the input message; and instructions for compensating the first portion output based upon the compensation factor.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: May 30, 2017
    Assignee: NXP B.V.
    Inventors: Wil Michiels, Jan Hoogerbrugge, Joachim Trescher
  • IMPLEMENTING PADDING IN A WHITE-BOX IMPLEMENTATION
    Publication number: 20160267258
    Abstract: A non-transitory machine-readable storage medium encoded with instructions for execution by a keyed encryption operation by a cryptographic system mapping an input message having an encoded portion and a padding portion to an output message, including: instructions for receiving a padding value k; instructions for receiving the input message, wherein the padding portion has a size indicated by the padding value k; instructions for computing a first portion of the encryption operation to produce a first portion output; instructions for computing a compensation factor corresponding to the padding portion of the input message; and instructions for compensating the first portion output based upon the compensation factor.
    Type: Application
    Filed: March 13, 2015
    Publication date: September 15, 2016
    Inventors: Wil Michiels, Jan Hoogerbrugge, Joachim Trescher
  • Converting program-specific virtual machine instructions into variable instruction set
    Patent number: 6292883
    Abstract: A source program is executed on microcontroller core 114 of a processing unit 100. The core 114 is capable of native instructions from a predetermined set of micro-controller specific instructions. In a pre-processing step, for the program statements of the source program a program-specific virtual machine is defined with a corresponding set of virtual machine instructions, such that the expression of the program statements in the sequence of instructions requires less storage space compared to using only native instructions. For the program-specific virtual machine an associated conversion means 132 is defined for converting the program-specific virtual machine instructions into the native instructions of the core 114. The source program statements are expressed in a sequence of instructions comprising instructions of the defined virtual machine. The sequence of instructions is stored in an instruction memory 120. The conversion means 114 is represented in the processing unit 100.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: September 18, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Alexander Augusteijn, Eelco J. Dijkstra, Paulus M. H. M. A. Gorissen, Franciscus J. H. M. Meulenbroeks, Paul Stravers, Joachim A. Trescher