Radio frequency transponder stored value system employing a secu

Details Radio frequency transponder stored value system employing a secu Radio frequency transponder stored value system employing a secu

1995-08-10

1998-11-03

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235380, H04K 100

Patent

active

058320903

ABSTRACT:
An encryption method and stored value system comprising a host computer, a reader/writer that communicates with the host computer, and an RF transponder that communicates with the reader/writer. The transponder comprises a transponder chip having a memory with a plurality of memory sections, which encryption method protects data stored in the memory. The method provides a secure way to increase and decrease the value stored the transponder and to selectively write and data to and from the transponder.

REFERENCES:
patent: 4453074 (1984-06-01), Weinstein
patent: 4910774 (1990-03-01), Barakat
patent: 5128997 (1992-07-01), Pailles et al.
patent: 5495098 (1996-02-01), Pailles et al.
patent: 5559887 (1996-09-01), Davis et al.

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