Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-09-18
1998-03-03
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 46, H04K 100
Patent
active
057244235
ABSTRACT:
A user authentication service is disclosed which is both highly secure and user friendly. To access a particular service, a user simply enters a personal identification type number (PIN) using a portable terminal device which encodes the PIN. More specifically, a character position of the user's PIN is determined, and a random code having a length selectable at each service transaction by the user is generated. The user's PIN is encrypted using one of plural available, pseudo-randomly encrypting algorithms to provide an encrypted PIN. The encrypted PIN is then combined with the code at the determined position before being transmitted over a communications network. When received, the encoded PIN is decoded using an analogous procedure to determine if the user is authorized. A plurality of security levels are provided with each level having a plurality of encryption algorithms and with each increasing level providing encryption algorithms of increasing complexity and sophistication. A user may also change a current PIN from the portable device easily and securely without having to contact a service center.
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Cain David C.
Telefonaktiebolaget LM Ericsson
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