International audience

We propose an on-site voting system Themis, that aims at improving security when local authorities are not fully trusted. Voters vote thanks to voting sheets as well as smart cards that produce encrypted ballots. Electronic ballots are systematically audited, without compromising privacy. Moreover, the system includes a precise dispute resolution procedure identifying misbehaving parties in most cases.

International audience

We show how to attack an implementation of AES on an FPGA where all bytes are processed in parallel. We introduce a new way of retrieving information, mixing algebraic properties and physical observations. The attack is based on a generalization of the Square Attack. We focus on the electromagnetic side-channel, but our results are still valid for power consumption analysis as they reflect a global phenomenon inside the chip; and so, this contrasts with situations where eavesdroppers take advantage of local electromagnetic emanations.