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In ACS systems, the two-factor step verification allows to grant the access only after a successful verification of both the user's access card and the user' face.

Note
titleAttention!

In this mode, the user’s access card should must always be applied first, and only then the user's face will be verified.

Two-factor step verification is performed in several stages. The block diagram of the two-factor step verification operation is presented below.

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