Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-09-30
1996-09-24
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
235380, 235492, 364408, 380 23, H04K 100
Patent
active
055598870
ABSTRACT:
A first transfer device receives a first transaction signal from a second transfer device and provides a first certification signal. The second transfer device receives the first certification signal and encrypts it to provide a first encrypted signal. The first transfer device receives the first encrypted signal and encrypts the first certification signal to provide a second encrypted signal. A transaction is verified in accordance with the first and second encrypted signals and stored value is transferred between the first and second transfer devices in accordance with the verifying. A third transfer device, separate from the first and second transfer devices, receives a second transfer signal from a selected one of the first and second transfer devices and provides a second certification signal. The selected transfer device receives the second certification signal and encrypts it to provide a third encrypted signal. The third transfer device receives the third encrypted signal and encrypts the second certification signal to produce a fourth encrypted signal. A transaction is verified in accordance with the third and fourth encrypted signals and stored value is transferred between the first selected transfer device and the third transfer device in accordance with the second verifying.
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Davis Terry L.
Hart James A.
O'Malley Michael F.
Russell James F.
Sears John W.
Cain David C.
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