Method of controlling access to restricted access data and commu

Cryptography – Key management – Having particular key generator

Patent

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Details

395575, 380 3, 379 95, 34082531, G06F 1500, H04L 900

Patent

active

054993725

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.

REFERENCES:
patent: 4475175 (1984-10-01), Smith
patent: 4484306 (1984-11-01), Kulczyckyj et al.
patent: 4596898 (1986-06-01), Permmaraju
patent: 4604499 (1986-08-01), Hughes
patent: 4626623 (1986-12-01), LaHaye
patent: 4638356 (1987-01-01), Frezza
patent: 4733345 (1988-03-01), Anderson
patent: 4905281 (1990-02-01), Surjaatmadja et al.
patent: 4962449 (1990-10-01), Schlesinger

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