Two-way paging system having reverse channel message frequency authentication
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United States of America Patent
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Sep 8, 1998
Grant Date -
N/A
app pub date -
Sep 30, 1996
filing date -
Sep 30, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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