By Jason Waddle, David Wagner (auth.), Marc Joye, Jean-Jacques Quisquater (eds.)
This booklet constitutes the refereed complaints of the sixth overseas workshop on Cryptographic and Embedded structures, CHES 2004, held in Cambridge, MA, united states in August 2004.
The 32 revised complete papers offered have been conscientiously reviewed and chosen from a hundred twenty five submissions. The papers are geared up in topical sections on facet channels, modular multiplication, low assets, implementation elements, collision assaults, fault assaults, implementation, and authentication and signatures.
Read or Download Cryptographic Hardware and Embedded Systems - CHES 2004: 6th International Workshop Cambridge, MA, USA, August 11-13, 2004. Proceedings PDF
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Extra resources for Cryptographic Hardware and Embedded Systems - CHES 2004: 6th International Workshop Cambridge, MA, USA, August 11-13, 2004. Proceedings
Increasing it much higher than 200 does not help: the level of the peaks with respect to the guesses does not evolve and converges to the same ranking. This particular counter-example proves that the ambiguity of DPA does not lie in imperfect estimation but in wrong basic hypotheses. TEAM LinG 26 E. Brier, C. Clavier, and F. Olivier Fig. 3. DPA biases on versus guesses for selection bits 1, 2, 3 and 4, on modeled and experimental data; the correct guess is 24. 3 Results of Model Based CPA For comparison the table hereafter provides the ranking of the 6 first guesses sorted by decreasing correlation rates.
2. Preliminary test Figure 1 illustrates2 a single power trace. Figure 2 illustrates the power consumption of vectors and during about 20 000 clock cycles. From this experiment, we conclude that the power consumption clearly depends on the number of transitions in registers. Based on these considerations, we used the following hypothesis to mount power analysis attacks against FPGAs: “an estimation of a device power consumption at time is given by the number of bit transitions inside the device registers at this time”.
Let three 4096-bit vectors be defined as follows. Initially, Then: where SL is the shift left operator and consecutive values by a register. It is easy to see that: and are separated is a bit-vector with a constant Hamming weight The position of the 1-bit inside the vector is incremented/decremented from 0 to 4095. is a bit-vector for which the Hamming weight is incremented/decremented from 0 to 4095. is a bit-vector for which the number of bit switches between two consecutive states is incremented/decremented from 0 to 4095.