Data scrambling system and method
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United States of America Patent
Stats
-
May 27, 1986
Grant Date -
N/A
app pub date -
Apr 18, 1983
filing date -
Apr 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Credit cards to be used with automated systems such as vending machines or the like have various identification and other data encoded on them for use with a particular system for which they are intended. To prevent persons familiar with the system operation and the manner of encoding data on such credit cards from developing unauthorized cards which will work in the system, a random number generator is used to produce a mask for relocating the bits of encoded data in a random manner to various locations on the credit card. This mask is stored in a microprocessor memory and is used both in encoding and decoding such cards.
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