On 23 August 2023, Orestis Alpos defended successfully his Ph.D. thesis “Distributed protocols with threshold and general trust assumptions”. The external examiner was Jesper Buus Nielsen from Aarhus University. Congratulations!
The CRYPTO group organized a retreat in Ligerz on beautiful Bielersee in July. All members gave insight into their current research work and explored future research ideas together. Everyone also presented some technical topic outside their comfort zone. A hike through the Twannbachschlucht concluded the event.
In May and July 2023, two researchers joined the team. Jayamine Alupotha obtained a Ph.D. degree in Computer Science from Queensland University of Technology (QUT) in Australia, with specialization in cryptography. She works in the area of secure distributed consensus protocols.
Luca Zanolini passed his Ph.D. exam successfully on 6 July 2023. His thesis is titled “Asymmetric Trust in Distributed Systems” The external examiner was Rachid Guerraoui, but he could not attend in person unfortunately. Congratulations!
In February 2023, Philipp Schneider has started as a postdoc in the CRYPTO research group. He holds a Ph.D. in computer science from the University of Freiburg (Germany), where he worked in the area of distributed algorithms.
Cryptocurrencies based on blockchain technology have been created as an alternative to regulated financial markets. But the almost 15-year history of Bitcoin, digital ledgers, and decentralized finance shows that these digital systems do not live in a vacuum: they exist for and through people.
Interdisciplinary Seminar in Civil Law and Computer Science - Distributed Trust in Finance
Our recent work on Quorum Systems in Permissionless Networks will be presented at the OPODIS 2022 conference. It is coauthored by Luca Zanolini and Christian Cachin of the University of Bern and Giuliano Losa of the Stellar Development Foundation.
Spring is coming - When does the snow melt?
The Cryptology and Data Security Research Group operates a mailing list for annoucements of talks in Bern and some occasional news items.
Sebati Ghosh has joined the Cryptology and Data Security group in March 2022.
A new, efficient protocol eliminates attacks on decentralized finance platforms and ensures a novel notion of differential order-fairness for transactions in atomic broadcast.
Welcome, Duc V. Le, to the Cryptology and Data Security group!
In October 2021, David Lehnherr has joined the team as a Ph.D. student. He graduated with a M.Sc. degree in Computer Science from the University of Bern in 2021. In his M.Sc. thesis he developed a logic of interactive proofs and is now looking into concurrency and cryptographic protocols in secure distributed systems.
Trust is the basis of any distributed, fault-tolerant, or secure system. A trust assumption specifies the failures that a system, such as a blockchain network, can tolerate and determines the conditions under which it operates correctly. In systems subject to Byzantine faults, the trust assumption is usually specified through sets of processes that may fail together. Trust has traditionally been symmetric, such that all processes in the system adhere to the same, global assumption about potential faults. Recently, asymmetric trust models have also been considered, especially in the context of blockchains, where every participant is free to choose who to trust.
In the spring term 2021, the Institute for Civil Law and the Institute of Computer Science jointly organized an interdisciplinary seminar with participants from the Faculty of Law and from the Faculty of Science.
Our recent research on the synchronization power of smart contracts explores the scalability of blockchain networks.
Welcome back, Nathalie Steinhauer! As of April 2021, Nathalie has joined the team as a Ph.D. student. She graduated with a M.Sc. degree in Computer Science from the University of Bern in early 2020. Her M.Sc. thesis addressed a practical implementation of distributed cryptography and was already carried out at the Cryptology and Data Security research group.
The Institute for Civil Law and the Institute of Computer Science will hold an interdisciplinary seminar on the topic of Distributed Trust and Blockchain. Students of computer science and law and will work closely together on questions concerning the blockchain and its potential in the legal domain. The goal of the seminar is to explore how the characteristics of blockchain technology can support the transfer and enforcement of rights.
A technical analysis of Ripple’s protocol reveals that it ensures neither safety nor liveness under the stated assumptions.
The Cryptology and Data Security Research Group organizes a seminar on Trusted Computing and Secure Protocols, to be held at Uni Bern on September 8, 2020, 10:15-12:00.
Congratulations to Orestis Alpos to the paper on Consensus Beyond Thresholds at SRDS 2020 in September. Due to the pandemic, the conference takes place online and nobody travels to Shanghai, unfortunately.
After starting teaching in cryptology and data security during 2019 and 2020, we are currently planning the following course offerings.
The seminar has been postponed due to the Coronavirus situation
Every year, the Association for Computing Machinery (ACM) recognizes the top 1% of its members for their outstanding accomplishments in computing and information technology.
In December 2019, Giorgia Azzurra Marson has joined the team as a postdoctoral researcher.
The first edition of the Swiss Crypto Day takes place on 5 September 2019 and is hosted by the crypto group at the University of Bern. It is an informal event to promote research in cryptology in Switzerland and will take place at irregular intervals.
As the third Ph.D. student in the group Ignacio Amores Sesar joins the team. Originally from Spain, he has a background in mathematics and most recently completed his M.Sc. at the University of Copenhagen in Denmark. Welcome!
Our paper Trusted Computing meets Blockchain: Rollback Attacks and a Solution for Hyperledger Fabric describes how to run smart contracts on Hyperledger Fabric within an Intel SGX trusted execution environment. It will appear at IEEE SRDS 2019 in Lyon this October. You’ll find the code on github in a Hyperledger Lab.
Started a new blog: Crypto@Bern
Welcome Orestis Alpos! He joins from Greece, where he studied Electrical Engineering and Computer Science at NTUA and graduated with a thesis topic linking computer security with machine learning.
Welcome Luca Zanolini! He has a degree in mathematics and joins the Cryptology and Data Security Research Group this month from a blockchain startup.
The website of the Cryptology and Data Security Research Group is live at crypto.unibe.ch, thanks to Jekyll, SCSS, and git.
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