Louis D Finkelstein

Author:

Louis Finkelstein

ISBN #:

0313212422

Author:

Louis Finkelstein

ISBN #:

0521218802

Author:

Louis Finkelstein

ISBN #:

0521219299

Author:

Louis Finkelstein

ISBN #:

0521243777

Author:

Louis Finkelstein

ISBN #:

0521802822

Author:

Louis Finkelstein

ISBN #:

0465050352

Author:

Louis Finkelstein

ISBN #:

0685314227

Author:

Louis Finkelstein

ISBN #:

0804602190

US Patent:

53197127, Jun 7, 1994

Filed:

Aug 26, 1993

Appl. No.:

8/112780

Inventors:

Louis D. Finkelstein - Wheeling IL
James J. Kosmach - Palatine IL
Jeffrey C. Smolinske - Hoffman Estates IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 928

US Classification:

380 44

Abstract:

A method and apparatus for providing cryptographic protection of a data stream are described in accordance with the Open Systems Interconnection (OSI) model for a communication system. This cryptographic protection is accomplished on the transmitting side by assigning a packet sequence number to a packet derived from a data stream received from a network layer. Subsequently, a transmit overflow sequence number is updated as a function of the packet sequence number. Then, prior to communicating the packet and the packet sequence number on a physical layer, the packet is encrypted as a function of the packet sequence number and the transmit overflow sequence number. On the receiving side, the packet sequence number is extracted from the physical layer. In addition, a receive overflow sequence number is updated as a function of the packet sequence number. Finally, the encrypted packet is decrypted as a function of the packet sequence number and the receive overflow sequence number.

US Patent:

56688750, Sep 16, 1997

Filed:

Jul 15, 1996

Appl. No.:

8/683590

Inventors:

Daniel Peter Brown - Elmhurst IL
Louis David Finkelstein - Wheeling IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 738

US Classification:

380 23

Abstract:

A method and apparatus for authenticating a roaming subscriber. In a preferred embodiment, a subscriber receives a challenge that is in a format of a local authentication protocol, and determines whether the local authentication protocol is the subseriber's home system authentication protocol. If it is not, the subscriber converts the challenge into a format (e. g. , bit length) compatible with its home system authentication protocol, and processes the converted challenge with the subscriber's secret key and authentication algorithm into an authentication response. The authentication response is converted to be compatible with the local authentication protocol, and transmitted to a local system communication unit. The challenge and response is then forwarded to the subscriber's home system for similar conversion and processing, and subscriber's response is compared against a home system generated response.

US Patent:

52218384, Jun 22, 1993

Filed:

Oct 20, 1992

Appl. No.:

7/964105

Inventors:

Jose Gutman - Boynton Beach FL
Jim Wright - Coral Springs FL
Louis D. Finkelstein - Wheeling IL
Larry Puhl - Sleepy Hollow IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 1530

US Classification:

235379

Abstract:

An electronic wallet includes memory for storing at least a balance corresponding to an account in a financial institution, and a selective call receiver for receiving a wireless message transmitted from a remote transmitter, the wireless message including financial information relating to the balance for confirming a financial transaction with the financial institution. A controller, coupled to the memory and to the receiver, can update the balance in the memory in response to the wireless message. communication system enters financial transactions into the communication system from one of a plurality of associated portable data devices, and updates the financial transactions from the communication system to the one and to at least a second of the plurality of associated portable data devices via wireless message communication from at least one remote transmitter.

US Patent:

55374743, Jul 16, 1996

Filed:

Jul 29, 1994

Appl. No.:

8/282832

Inventors:

Daniel P. Brown - Elmhurst IL
Louis D. Finkelstein - Wheeling IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 932
H04M 1100

US Classification:

380 23

Abstract:

A method and apparatus for authenticating a roaming subscriber. In a preferred embodiment, a subscriber receives a challenge that is in a format of a local authentication protocol, and determines whether the local authentication protocol is the subscriber's home system authentication protocol. If it is not, the subscriber converts the challenge into a format (e. g. , bit length) compatible with its home system authentication protocol, and processes the converted challenge with the subscriber's secret key and authentication algorithm into an authentication response. The authentication response is converted to be compatible with the local authentication protocol, and transmitted to a local system communication unit. The challenge and response is then forwarded to the subscriber's home system for similar conversion and processing, and subscriber's response is compared against a home system generated response.

US Patent:

52392945, Aug 24, 1993

Filed:

Dec 7, 1990

Appl. No.:

7/626227

Inventors:

Mary B. Flanders - Wood Dale IL
Louis D. Finkelstein - Wheeling IL
Larry C. Puhl - Sleepy Hollow IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 100

US Classification:

34082534

Abstract:

Radio frequency based cellular telecommuication systems often require a subscriber (10) to maintain a proprietary identifier (19) or serial number (18) which is transmitted to a fixed network communication unit (20) to verify the authenticity of the subscriber (10). An enciphering and call sequencing method and apparatus are provided which can decrease unauthorized detection of these proprietary ID's (18, 19). This method and apparatus permit efficient roaming by allowing authentication variables for multiple calls to be sent from the "home" system (20) to the "visted" system and stored by the "visted" system for use with subsequent calls. Further, a method and apparatus are provided which force the authenticating mobile (10) to use information that only it has available to itself. Furthermore, a method and apparatus are provided which allow continued encryption integrity during handoffs by maintaining a record of pseudo random events between a subscriber unit (10) and any radio communication unit (20) and using that record as an encryption variable.

US Patent:

54673984, Nov 14, 1995

Filed:

Jul 5, 1994

Appl. No.:

8/270564

Inventors:

Jennifer A. Pierce - Algonquin IL
Louis D. Finkelstein - Wheeling IL
Daniel P. Brown - Elmhurst IL
Jay R. Krebs - Crystal Lake IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 922
H04L 932
H04L 916

US Classification:

380 44

Abstract:

A communication system (100) employs a method of messaging between a subscriber unit (105) and an infrastructure communication center (101). A messaging key associated with a subscriber unit reference number is provided (203, 403) to the subscriber unit (105) and to the infrastructure communication center (101). An authentication key and/or an identifier for the subscriber unit (105) is then produced (300, 407) by either the subscriber unit (105) or the infrastructure communication center (101). The authentication key and/or the identifier is encrypted (207, 413) with the messaging key and is subsequently communicated (209, 415) between the subscriber unit (105) and the infrastructure communication center (101).

US Patent:

54558638, Oct 3, 1995

Filed:

Jun 29, 1993

Appl. No.:

8/084664

Inventors:

Daniel P. Brown - Elmhurst IL
Louis D. Finkelstein - Wheeling IL
Jeffrey C. Smolinske - Hoffman Estates IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 932
H04B 169

US Classification:

380 23

Abstract:

Radio frequency based cellular telecommunication systems often require both subscriber units and communication units of a fixed network communication system to maintain secret data which may be used to verify authenticity as well as provide encrypting variables for message encryption processes. An efficient real-time authentication method and apparatus are provided which use a single message to provide authentication and communication link setup information. Further, an authentication method and apparatus are provided which uses instant-specific information such as a time of day, radio frequency carrier frequency, a time slot number, a radio port number, access manager identifier, a radio port control unit identifier, or a base site controller identifier to enhance the reliability of the authentication process. Furthermore, a method and apparatus are provided for maintaining secure packet data communications through an encryption process by utilizing a packetized message encryption key and a unique packet number as encryption variables.

US Patent:

58418644, Nov 24, 1998

Filed:

Aug 5, 1996

Appl. No.:

8/693688

Inventors:

Jeffrey T. Klayman - Mansfield MA
Louis D. Finkelstein - Wheeling IL
Christopher L. Clanton - Forest Park IL

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H04L 908

US Classification:

380 21

Abstract:

The apparatus (101, 110) and method for authentication is provided by generating R and encrypting it using a selected algorithm K as the key in a primary station, encrypting the verification key, V using R as the key and encrypting the result using K as the key, transmitting both pieces of information (VAR1 and VAR3) to the secondary station (110), using K to decrypt VAR1 and VAR3 to obtain R and eventually V which is encrypted using R in the secondary station (110)verifying authenticity of the primary station (101) if the decrypted V matches the secret key portion of V that is stored at the secondary station (110).