 Tumper. Tumper protection purpose is to detect physically a tempering in a secure application and to automatically erase sensitive data in case of intrusion. It is part of the ATC domain and available in all the low-power mode including VBAT, I mean on the battery. When we detect such kind of events, we can error the backup registers, we can prohibit access to the backup SRAM or Erasets and we can generate a timestamp event. The temper protection is available in all our family. After I recommend you to have a look in the reference manual of each family to see the details. When we talk about passive temper detection, you just check a static signal. I mean that we've got one pin and if this level of the pin goes to an inactive state, then we have an event. But if an attacker managed to show the temper input pin to this inactive state, then there is no temper event detection. So on the STM32L file, we propose a new mechanism which is the active tempering. This feature increases security level by an auto-checking that the temper pin are not externally open or short. This is achieved by a generation of a random pattern on the input-output pin. So on a passive temper, only one pin is needed for the temper activation or check. And in this case of active tempering, you need to pin a pin-out and a pin-in. You will generate a random waveform on the pin-out and you will check in the pin-in that this random waveform is there again. This is done automatically by the hardware. As previously said, the temper is available in all our family. But notice the active temper is today only available on the L5. I propose now to switch to the hands-on.