Blockchain technologies have recently proliferated as a future emerging technology. A key feature of blockchains is the ability to let a group of nodes agree upon the next block. The task for the agreement is known as consensus. In this article, we discuss two fundamental consensus protocols, namely Paxos and Zyzzyva. 1 Introduction In modern network systems, multiple participants often have to harmonize with each other, to find a common conclusion or make a global valid decision. In most cases this works fine, by just sending messages in between the participants. But what happens, if one ore more participants in…

Side Channel Attacks Final Remarks

January 28, 2018 Written by Thomas Carstensen
Hello World. Our final semester draws to a close and so this project has to end as well. We have invested a lot of time and learned the magic behind the sidechannel-analysis. The ChipWhisperer from NewAE Technology is a well-made system to get into the basics of the most important Attacks. We have learned the basics about the Power Analysis, Timing Attacks and Glitching. We had to make ourselves familiar with cryptography, mathematic and statistic to use the information for getting access into the system and breaking the encryption algorithms. After the basic tutorials we kept us busy with the…

Breaking AES with an Oscilloscope

January 28, 2018 Written by Thomas Carstensen
The ChipWhisperer-Lite is a good platform to learn the basics of side channel attack. As we go further we need more power to break more applications and hardware. Our institute has a Rhode & Schwarz RTO 1022 digital oscilloscope with 2 GHz and 10GSa/s. Special thanks to Prof. Dr. Kruse who gave us the chance to use this device for our purpose. This digital oscilloscope (DSO) offers better performance than the ChipWhisperer and the option to save the data on an USB flash drive to calculate on a PC. Illustration 1: Measure setup with Oszilloskop Illustration 2: Measure setup In…
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