Some time ago, the most common mechanism for getting into an office was a simple key. Simple but vulnerable. Conventional locks do not identify people and can be used by anyone. In addition, it is impossible to control the number of hours worked. Technology has provided a solution to this issue. There are now different techniques not just for opening doors but also for identifying staff and recording the time they enter and leave the premises. From a card to the voice, through the flash on a phone. There are many alternatives, but are these systems secure? Using radio frequency-based methods such as Bluetooth, NFC (Near Field Communication) or RFID is simple. In the first two cases, all you need is a cell phone with this technology that can be recognized by a sensor. RFID chips are inserted in cards or even wristbands that open turnstiles and provide the employee details.

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