Individualizing Electrical Circuits of Cryptographic Devices as a Means to Hinder Tampering Attacks.
Zoya Dyka, Thomas Basmer, Christian Wittke, Peter Langendörfer · 2015
Abstract. Side channel and fault attacks take advantage from the fact that the behavior of crypto implementations can be observed and provides hints that simplify revealing keys. In a real word a lot of devices, that are identical to the target device, can be attacked before attacking the real target to increase the success of the attack. Their package can be opened and their electromagnetic radiation and structure can be analyzed. Another example of how to improve significantly the success rate of attacks is the measurement of the difference of the side channel leakage of two identical devices, one of these devices being the target, using the Wheatstone bridge measurement setup. Here we propose to in-dividualize the electrical circuit of cryptographic devices in order to prevent at-tacks that use identical devices: attacks, that analyze the structure of devices identical to the target device in a preparation phase; usual side channel attacks, that use always the same target device for collecting many traces, and attacks that use two identical devices at the same time for measuring the difference of side-channel leakages. The proposed individualization can prevent such attacks