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[nRF51822] Access control system

Hi We know most of access contol for entrance was implmented by RFID. Is it feasible to design it by BT4.0? My idea is as below. Thanks for your comment.

  1. There is a BTLE device (nRF51822) installed in the office entrance. Its role is to recieve BTLE host
    identification packet and judge if the employee have access to enter the office.
  2. The BTLE host would be a smart phone. Each employee was registered in advanced and got a identificatioon number.
  3. BTLE device (nRF51822) also detects RSSI to judge the employee is entering or exiting the office.