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US 8,280,820 B2
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transmission time of the ?rst data packet has exceeded a
and wherein the coded ?eld and the at least one additional
coded ?eld of the second packet are contained Within the
predetermined threshold; and
data portion of the second packet.
transmitting, by the computer-based system, an alert mes
19. An article of manufacture including a non-transitory,
sage in response to the determination that the response
time of the second data packet relative to the transmis
sion time of the ?rst data packet has exceeded the pre
tangible computer readable medium having instructions
stored thereon that, in response to execution by a computer
based system for capturing data packets, cause the computer
based system to be capable of performing operations com
determined threshold,
Wherein the ?rst packet and the second packet each contain
prising:
a header portion and a data portion distinct from the
determining, by the computer-based system, that a cap
header portion,
tured ?rst data packet includes a ?rst pattern in a coded
?eld, Wherein the ?rst data packet includes an authori
Zation request for a transaction;
and Wherein the coded ?eld and at least one additional
coded ?eld of the ?rst packet are contained Within the
data portion of the ?rst packet,
determining, by the computer based-system, that a cap
tured second data packet includes a second pattern in the
coded ?eld that corresponds to the ?rst pattern of the ?rst
data packet,
determining, by the computer-based system, that a
response time of the second data packet relative to a
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and Wherein the coded ?eld and the at least one additional
coded ?eld of the second packet are contained Within the
data portion of the second packet.