Radiotelephone controller configured for coresident secure and n

Details Radiotelephone controller configured for coresident secure and n Radiotelephone controller configured for coresident secure and n

1990-01-05

1991-10-22

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 23, 380 33, H04L 900

Patent

active

050602640

ABSTRACT:
A controller for a radiotelephone having the capability of operation in both a secure mode for call authorization and a nonsecure mode for user interface is disclosed. The nonsecure mode and secure mode of operation are both resident in a single microcontroller which runs the nonsecure operations until a requirement for the secure operation is requested during call placement. The nonsecure mode is disabled during the period of time the secure mode is operational and is reenabled upon completion of the secure mode operation. The secure mode cannot be accessed externally to the microcontroller.

REFERENCES:
patent: 4228321 (1980-10-01), Flanagan
patent: 4368357 (1983-01-01), Gurak
patent: 4555805 (1985-11-01), Talbot
patent: 4560832 (1985-12-01), Bond et al.

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