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IP.com Disclosure Number: IPCOM000009441D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-23
Document File: 2 page(s) / 91K

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Joyce Hegarty: AUTHOR


This paper describes a low cost method of per- sonalizing a radio. The method employs a password which consists of a particular sequence of key- strokes which are entered within particular time windows. The method proposed provides security against unauthorized use.

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MO7OROLA Technical Developments


by Joyce Hegarty

the user it remains in the non-functional mode, i.e. cannot be used to make a call.

  The password is based both on particular keys and on time division slots. This means that the user:

  1. must press specific keys on the radio in a par- ticular sequence;

  2. that each keystroke must occur within a par- ticular time-window; and

  3. all the keystrokes which make up the pass- word must be made in a particular predetermined length of time from the moment the radio is switched-on, e.g. 5 seconds, to enter the password.

  The password can consist of as many key- strokes, alternating with spaces in between, as the user wishes. Software in the radio defines the time constraints within which the user must enter the keystrokes and spaces.

  To personalize the radio to one particular user, that user may first set the password by at least once making the keystrokes which are to form the pass- word. The radio will from then on require the same keystrokes to be entered each time that the radio is switched on. The software will be designed with some hysteresis and rules of use, because the same user may not always repeat the number of key- strokes at exactly the same speed as when they first recorded the password.

  The microcontroller in a modem two-way radio is able to support the personalization method pro- posed in this paper. The radio will still support the basic features to meet the user's needs and maintain reduced costs. The additional personalization mech- anism proposed in this paper will not increase the cost of a radio, but will improve the radio's security. The method proposed provides security against unauthorized use and will render the radio nonfunc- tional if stolen.

0 Motom1a, 1°C. ,999 75 September 1999


  This paper describes a low cost method of per- sonalizing a ra...