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==Operating principle==
The CAP specification supports several authentication methods. The user first inserts
*'''Identify:''' Without requiring any further input, the CAP reader interacts with the smartcard to produce a decimal [[one-time password]], which can be used, for example, to log into a banking website.
*'''Response:''' This mode implements [[challenge-response authentication]], where the bank's website asks the customer to enter a "challenge" number into the CAP reader, and then copy the "response" number displayed by the CAP reader into the web site.
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