Patents by Inventor Jack D. LaBounty

Jack D. LaBounty 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: 5301247
    Abstract: A method for initiating secure communications between two stations. In this method, a first portion of a session data encryption key (DEK1) is randomly generated by an EDU in one of the stations. The DEK1 is then encrypted using a key exchange key (KEK) selected from a table as a function of a check value determined by applying the DEK1 to encrypt a predefined zero function. The encrypted DEK1 is transmitted to the other station, along with an encrypted EDU ID number for the station that generated the DEK1 and a cyclic redundancy check (CRC) value of the KEK table. The encrypted table entry value used to define the KEK is decrypted at the other station, and a check is made to determine if the KEK table CRC and the EDU ID are correct. If not, communication is terminated.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: April 5, 1994
    Assignee: Crest Industries, Inc.
    Inventors: Harry R. Rasmussen, Jack D. LaBounty, Michael J. Rosenow
  • Patent number: 5237611
    Abstract: An encryption/decryption unit (EDU) that handles management of encryption keys used in the secure exchange of data over non-secure communication links. Each EDU includes a central processing unit (CPU) that controls its operation, random access memory (RAM) in which tables of key exchange keys (KEKs) are stored, and a data encryption standard (DES) coprocessor that implements a data encryption algorithm developed by the U.S. National Bureau of Standards--all comprising a module that is embedded in a potting material. Attempts to remove the potting material either by mechanical or solvent means are likely to result in loss of the data and program code stored in the module. The CPU includes special circuitry enabling it to operate in an encrypted mode so that it can not be interrogated to discover the program or data stored therein. This program enables the EDU to establish secure communications with another similar EDU over a non-secure link.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: August 17, 1993
    Assignee: Crest Industries, Inc.
    Inventors: Harry R. Rasmussen, Jack D. LaBounty, Michael J. Rosenow
  • Patent number: 5222136
    Abstract: A system for exchanging encrypted data between selected devices at stations comprising a network. The system includes an encrypted communications device (ECOM) (12) that selectively encrypts data from one of a plurality of different devices. With the ECOM, a user selectively encrypts voice transmissions from a telephone, facsimile transmissions produced by a facsimile machine, or data transmissions, either from a personal computer (PC) or from a modem connected to a PC for transmission over non-secure telephone lines (18) to another such device connected to an ECOM at the other location. The receiving ECOM initiates secure communications by encrypting a portion of a data encryption key (DEK) that is transmitted back to the first ECOM, which decrypts it and then generates a second portion of the DEK for transmission back to the receiving ECOM. These two portions are then exclusively ORed (XORed) together by each ECOM to determine the DEK for use in encrypting and decrypting data during the current session.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: June 22, 1993
    Assignee: Crest Industries, Inc.
    Inventors: Harry R. Rasmussen, Jack D. LaBounty, Michael J. Rosenow, John D. Hoskinson, Joseph G. Maurin