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Pietrzak Group


Cryptography, the science of information security, is often relegated to the realm of spies and secret agents. However, we all rely on cryptography on a daily basis, for example when using internet banking or a wireless car key.

The cryptography group at ISTA works on theoretical and practical aspects of cryptography, including:

Crypto for light-weight devices. The team works towards provably secure cryptographic schemes for light-weight devices such as RFID tags, which are too constrained to run existing cryptographic schemes.

Leakage-resilient cryptography. This project aims to construct schemes that are provably secure against “side-channel attacks”. These are attacks in which an attacker exploits information leaked during computation from a cryptographic device like a smart card.

Sustainable Cryptocurrencies. Bitcoin is the first successful digital currency. Its popularity comes from the fact that it is decentralized, so no central authority controls it. To achieve security despite decentralization, a huge amount of computing power is constantly wasted towards generating “proofs of work”. This is economically and ecologically problematic. The Pietrzak group works towards more sustainable cryptocurrencies.

On this site:


Current Projects

Leakage-resilient cryptography | Cryptosystems for light-weight devices | Computational entropy | Memory-hard functions | Cryptocurrencies


Schmid S, Svoboda J, Yeo MX. 2023. Weighted packet selection for rechargeable links in cryptocurrency networks: Complexity and approximation. SIROCCO 2023: Structural Information and Communication Complexity . SIROCCO: Structural Information and Communication Complexity, LNCS, vol. 13892, 576–594. View

Hoffmann C, Hubáček P, Kamath C, Pietrzak KZ. 2023. Certifying giant nonprimes. Public-Key Cryptography – PKC 2023. PKC: Public-Key Cryptography, LNCS, vol. 13940, 530–553. View

Baig MA, Hendler D, Milani A, Travers C. 2023. Long-lived counters with polylogarithmic amortized step complexity. Distributed Computing. 36, 29–43. View

Bogdanov A, Cueto Noval M, Hoffmann C, Rosen A. 2022. Public-Key Encryption from Homogeneous CLWE. Theory of Cryptography. TCC: Theory of Cryptography, LNCS, vol. 13748, 565–592. View

Avarikioti G, Pietrzak KZ, Salem I, Schmid S, Tiwari S, Yeo MX. 2022. Hide & Seek: Privacy-preserving rebalancing on payment channel networks. Financial Cryptography and Data Security. FC: Financial Cryptography and Data Security, LNCS, vol. 13411, 358–373. View

View All Publications

ReX-Link: Krzysztof Pietrzak


since 2016 Professor, Institute of Science and Technology Austria (ISTA)
2011 – 2016 Assistant Professor, Institute of Science and Technology Austria (ISTA)
2005 – 2011 Scientific Staff Member, Centrum Wiskunde & Informatica, Amsterdam, The Netherlands
2006 Postdoc, École Normale Supérieure, Paris, France
2005 PhD, ETH Zurich, Switzerland

Selected Distinctions

2015 ERC Consolidator Grant
2010 ERC Starting Grant

Additional Information

Download CV
Open Pietrzak group website
Physics & Beyond at ISTA

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