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Table 5 Sequence of messages and actions for data authentication ceremony

From: Local user-centric identity management

Nr. Message/action description
1. User types the transaction data in a browser window on the client computer
2. User activates the OffPAD to take a snapshot of the browser window
3: Snapshot is taken of the text displayed in the browser window on the VDU
4. The OCR function recovers the transaction data from the snapshot
5. MAC generation with the transaction data and the user-password as input
6. OffPAD send the MAC to the client computer
7. Client computer sends transaction data together with MAC to server
8. Server verifies that the MAC corresponds to the received transaction data.