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1. (WO2016062386) METHOD FOR AUTHENTICATING A USER DEVICE DURING THE PROCESS OF LOGGING INTO A SERVER

Pub. No.:    WO/2016/062386    International Application No.:    PCT/EP2015/002039
Publication Date: Fri Apr 29 01:59:59 CEST 2016 International Filing Date: Fri Oct 16 01:59:59 CEST 2015
IPC: H04L 29/06
H04L 9/32
H04W 12/06
Applicants: UNIFY GMBH & CO. KG
Inventors: LEDERER, Thomas
Title: METHOD FOR AUTHENTICATING A USER DEVICE DURING THE PROCESS OF LOGGING INTO A SERVER
Abstract:
The invention relates to a computer system (10) and to a method for authenticating a user device (Bm) associated with a user during the process of logging into a server (20), wherein the user device (Bm) belongs to a user device group (B1-Bn) known to the server (20) and has both a user ID (IDBm) and a password (PBm), which are known to the server (20). The method comprises the following steps: a) the server (20) generates input requests (Et1-Etx), each of which is valid only during a defined time period, and displays said input requests (Et1-Etx) individually in succession in a login screen (31), b) the user device (Bm) reads in the input request (Et2) displayed at the time of the login and calculates a response (ABm) by using said input request (Et2), the password (PBm) of the user device, and the current time (t2), c) the user device (Bm) transmits the calculated response (ABm) to the login screen (31), d) the response (ABm) is transmitted by the login screen (31) to the server (20), e) at least for part of the user device group (B1-Bn), the server (20) calculates a response (AS1-ASn) in each case by using the input request (Et2) displayed at the time of the login, the particular password (PB1-PBn), and the current time (t2) and compares the responses (AS1-ASn) calculated by the server with the response (ABm) transmitted by the user device (Bm), and f) the server (20) confirms the authentication for that user device (Bm) for which the response (ASm) calculated by the server (20) matches the response (ABm) transmitted by the user device (Bm).