| 摘要 |
<p>The invention relates to a method 20 for accessing a service. According to the invention, each user device 12 stores one first key. One user terminal 14 stores or accesses the first key. The user device is connected to a first server 16. The terminal sends to a second server 18 a connection request 22. The second server sends, as response 24, to the terminal first data relating to a transaction identifier and a challenge. The challenge is associated with the transaction identifier. The terminal determines a first result depending upon the first data and the first key. The terminal sends to the first server the first result 26 and user device data. The first server determines a user device to be addressed based upon the user device data and sends to the device the first result 28. The device determines the challenge and the transaction identifier based upon the first result and the first key and sends to the second server the challenge and the transaction identifier, as second data 210. The second server verifies that the second data received from the device does match the first data sent to the terminal and, only when matching, authorizes the terminal to connect. The invention also relates to a corresponding system.</p> |
