Method of controlling access to restricted access data and communication system therefor
US5499372A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Feb 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/313
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In electronic communication systems, negotiations are performed between two pieces of apparatus (e.g. modems) in order to ensure technical compatibility during subsequent data transmission. Instead of performing security checks in the known manner after the negotiations have been completed (e.g. sending an access code or identity code), the invention teaches that the negotiations themselves should be customized to include security checks. For example, during negotiations between a call modem and an answer modem, the call modem includes a "first indication" in the negotiations. The answer modem detects the "first indication" and permits the call modem to have access to restricted access data during data transmission after the negotiations have been completed. The "first indication" may comprise a negotiation segment having a precise length and/or containing an embedded code. The answer modem may include a "second indication" in the negotiations in order to trigger the call modem to produce the "first indication". Also, the call modem may include a "third indication" in the negotiations after the "first indication" in order to identify more precisely or uniquely the call modem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.