Methods and apparatus for providing a secure paging system

Details Methods and apparatus for providing a secure paging system Methods and apparatus for providing a secure paging system

1992-12-14

1994-02-08

Swann, Tod R.

Cryptography

Cryptanalysis

380 49, 379 57, 34082544, H04K 102

Patent

active

052854965

ABSTRACT:
A paging system which sends and receives encrypted messages. The message may be encrypted either by the sender of the message or by the paging system. Multiple keys may be used for encrypting and decrypting. Public key systems may also be used and integrated into this paging system. The paging system can send out time update messages containing the current time and date. The pagers use the time update messages to automatically update the time in an internal clock. Time stamps can be inserted into the encrypted messages to prevent unauthorized users from replaying old messages.

REFERENCES:
patent: 4803726 (1989-02-01), Levine et al.
patent: 4882579 (1989-11-01), Siwiak
patent: 5018196 (1991-05-01), Takaragi et al.
patent: 5072444 (1991-12-01), Breeden et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5168271 (1992-12-01), Hoff

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