By Forest Products Laboratory

Ready through wooded area items Laboratory, wooded area carrier, U. S. Dept. of Agriculture and through ANC-23 Panel on Sandwich building for plane, Subcommittee on Air Force-Navy-Civil airplane layout standards, plane Committee, Munitions Board.

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8. Electrical signatures when performed DPA attack on bit 4 of the SBOX1. 000 point. As the SBOX1 has four output bits encoded in dual-rail, we have 8 data-paths (from outputs to inputs) which enable to compute 8 values of dxi(tj ). Let’s recall that, dxi(tj )(d0i(tj );d1i(tj )) corresponds to the amount of dissipated power when the attacked bit is processed at time tj . For example, let’s consider the output bit 4 of the SBOX1. Contrary to a standard approach and due to the 8 delay shifts, the values d04(tj ) and d14(tj ) are processed 4 times instead of being processed 32 times, so that their weights are reduced by a factor 8 into sets S1 and S0.

However, for the needs of illustration only the acknowledgment signal of the inputs of the SBOX1 is randomly delayed with 8 different delays. The defined selection function, used to implement the attack, is as follows: D(Cn,P6,K0)= SBOX1(P6⊕ K0) with n ∈ {1,2,3,4} The DPA attack has been implemented on the four output bits of the SBOX1 and on the first iteration of the DES algorithm using 64 plaintext inputs (N=64). Figure 7 shows the current profile of the first iteration when the RTS acknowledgment signal is activated and deactivated.

J. Bainbridge, A. Bardsley, J. D. Garside and S. Temple, “SPA - A Synthesisable Amulet Core for Smartcard Applications”, Proceedings of the Eighth International Symposium on Asynchronous Circuits and Systems (ASYNC 2002). Pages 201-210. Manchester, 8-11/04/2002. Published by the IEEE Computer Society. 4. Jacques J. A Fournier, Simon Moore, Huiyun Li, Robert Mullins, and Gerorge Taylor,“Security Evalution of Asunchronous Circuits”, CHES 2003, LNCS 2779, pp 137-151, 2003. 24 F. Bouesse, M. Renaudin, G.

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