Ph.D. positions are available in the Cryptology and Data Security research group at the Institute of Computer Science, University of Bern, led by Christian Cachin. For information about the group, see https://crypto.unibe.ch/ Our research addresses all aspects of security in distributed systems, especially cryptographic protocols, consistency, consensus, and cloud-computing security. We are particularly interested in blockchains, distributed ledger technology, cryptocurrencies, and their security and economics. Candidates should have a strong background in computer science. They should like conceptual, rigorous thinking for working theoretically, or be interested in building innovative systems for working practically. Demonstrated expertise in cryptography, distributed computing, or blockchain technology is a plus. Applicants must hold a master degree in the relevant research fields. Positions are available starting January 2021 and come with a competitive salary. The selection process runs until suitable candidates have been found. The University of Bern conducts excellent research and lives up its vision that "Knowledge generates value". The city of Bern lies in the center of Switzerland and offers some of the highest quality of life worldwide. If you are interested, please apply be sending email with **one single PDF file** and subject line **Application for Ph.D.**, addressed directly to Prof. Christian Cachin at: crypto (at) inf.unibe.ch. Since we receive many applications, we encourage you to include material that demonstrates your interests and strengths and sets you apart from others. For more information, please contact Christian Cachin (https://crypto.unibe.ch/cc/).