Patents by Inventor Chris Holloway

Chris Holloway 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).

  • Patent number: 6219651
    Abstract: The invention presented describes the protection of transaction data in cash-free payment traffic from its creation to its processing by means of stock-exchange chip cards (4). In each payment transfer, transaction data TDi (10) is created on the individual payment procedure, and cumulative data SD (81) on the payment transactions since the last data exchange with the settlement position are summarized. The transaction data TDi is stored in the payment terminal. The cumulative data SD is stored in the security module. In each payment transaction, the cumulative data is supplemented by the new amount. The cumulative data is stored using a cumulative signature Ssn (82) which is applied to each supplement to the cumulative data. In this, the value of the previous cumulative signature is used as an initial value for the formation of the new cumulative signature. The key of the payment terminal or a separate individual key can be used. The cumulative signature is also stored in the security module.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: April 17, 2001
    Assignee: International Business Machines Corporation
    Inventors: Hermann Bublitz, Chris Holloway, Adam Newth