Two-way paging system having reverse channel message frequency a

Details Two-way paging system having reverse channel message frequency a Two-way paging system having reverse channel message frequency a

1996-09-30

1998-09-08

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

455 313, G08B 522, H04Q 700

Patent

active

058050779

ABSTRACT:
A method of modifying reverse channel messages in a two-way paging system (101) to authenticate reverse channel messages is disclosed. The intended frequency of the reverse channel message is converted into a unique binary integer. The binary integer is used to modify a checksum (207) in the reverse channel message so that the checksum is now dependent upon not only the message (205) contents but also the intended frequency of the reverse channel message. When received by a paging receiver (109) of the paging system, an identical calculation takes place and if the modified checksum transmitted with the reverse channel corresponds with the calculated checksum, the message is authenticated. Otherwise, the reverse channel message is rejected.

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