Abstract.Power analysis presents the typical example of successful attacks against trusted cryptographic devices such as RFID (Radio-Frequency IDentifications)

Differential power analysis (DPA) is a powerful side‐channel key recovery attack that efficiently breaks cryptographic algorithm implementations. In order to prevent these types of attacks, hardware designers and software programmers make use of masking and hiding techniques. DPA contest is an international framework that allows researchers to compare their power analysis attacks under the same conditions. The latest version of DPA contest, denoted as V4.2, provides an improved implementation of the rotating S‐box masking scheme where low‐entropy boolean masking is combined with the shuffling technique to protect Advanced Encryption Standard implementation on a smart card. The improvements were designed based on the awareness of implementation lacks analyzed from attacks carried out during the previous DPA contest V4. Therefore, this new approach is devised to resist most of the proposed attacks to the original rotating S‐box masking implementation. In this paper, we investigate the security of this new implementation in practice. Our analysis, focused on exploiting the first‐order leakage, discovered important lacks. The main vulnerability observed is that an adversary can mount a standard DPA attack aimed at the S‐box output in order to recover the whole secret key even when a shuffling technique is used. We tested this observation on a public dataset and implemented a successful attack that revealed the secret key using only 35 power traces. Copyright © 2017 John Wiley & Sons, Ltd.

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The aim of this paper is an introduction to a very specific area of civil engineering, which is known as tensile structures (structures acting only in tension). These structures are associated with unique aspects of their design. As a result of practically zero bending stiffness, it is not possible to separate the shape and the static analysis of these structures. Shape generation is the aim of the process well known as form-finding. As a consequence of these and many other facts, it is necessary in this case to use a special way of design process, which abounds in many differences in comparison with usual design process.