<p>A method for securing a system comprising a first device cooperating with a second device, in which the first device and the second device respectively comprise a first encryption feature and a second encryption feature, performs a mutual verification of identity between the first device and the second device. The cooperation between the first device and the second device is interrupted if the mutual verification of identity between the first device and the second device fails. The method may verify in either one device a determined data received from the other device, the determined data resulting from a use of the encryption feature of the other device.</p>
