| 摘要 |
<p>A control signal triggering a transfer of a secret value into an element (24) of a circuit (20). In response to the control signal, a dummy value and the secret value are inserted in succession into the element of the circuit. This impedes side channel non-invasive power monitoring techniques, for example by using a dummy which is the inverse of the secret, and overwriting the dummy with the secret or vice versa in succession. The dummy may also be a non-constant, random value or string of alternating bits. The secret and dummy values may be toggled between the pair of registers so that at each clock cycle one of the registers holds a valid secret code.</p> |
