Abstract: The protection device (1) avoids accidental or fraudulent intrusion of at least one contactless communication object (3) with a smart circuit (31, 32) storing sensitive information or information giving access to services, the electronic circuit of the protected object remaining unchanged, notably by means (13) for receiving radio signals (S22) in a range of frequencies of the order of one megahertz to a few tens of megahertz, the received radio signals generating the operating power for enabling a circuit (11) generating a scrambling signal to be emitted by emission means (14) of the protection device as scrambling radio waves (S21) and switching means (12) validating or invalidating the operation of the generator of the scrambling signal of the protection device.

Abstract: The invention relates to a simple protection device (1) against accidental or fraudulent intrusion of at least one contactless communication object (3) with a smart circuit (31, 32) storing sensitive information or information giving access to services, the electronic circuit of the protected object remaining unchanged, notably by means (13) for receiving radio signals (S22) in a range of frequencies of the order of one megahertz to a few tens of megahertz, the received radio signals generating the operating power for enabling a circuit (11) generating a scrambling signal to be emitted by emission means (14) of the protection device as scrambling radio waves (S21) and switching means (12) validating or invalidating the operation of the generator of the scrambling signal of the protection device.