Method and system for calculating a user account balance in a re

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 23, 340928, 342 42, 342 51, H04L 900, G01S 1376

Patent

active

058091424

ABSTRACT:
A system and method in which a transponder (14) is operable to transmit an original user account balance to an interrogator (12), which in turn calculates a revised user account balance and transmits the revised user account balance to the transponder (14). In one embodiment of the invention, the transponder (14) is further operable to transmit a verification user account balance back to the interrogator (12), which then compares verification user account balance to the revised user account balance that was earlier calculated and stored in an interrogator memory.

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