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1. (WO1997011443) METHOD AND APPARATUS FOR USER AUTHENTICATION

Pub. No.:    WO/1997/011443    International Application No.:    PCT/SE1996/001157
Publication Date: Mar 27, 1997 International Filing Date: Sep 18, 1996
IPC: G07C 9/00
G07F 7/10
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
Inventors: KHELLO, Robert
Title: METHOD AND APPARATUS FOR USER AUTHENTICATION
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 devices 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.