Christian Schaffner received a diploma degree in mathematics from ETH Zurich (Switzerland) in 2003 and a PhD degree in computer science from Aarhus University (Denmark) in 2007. After being a postdoctoral scholar at CWI Amsterdam, he is now an Associate Professor of Theoretical Computer Science at the Institute for Logic, Language and Computation (ILLC) at the University of Amsterdam. He is a senior researcher at QuSoft, the Dutch research center for quantum software. He is a world-leading expert in quantum cryptography, both on post-quantum cryptography and and on the design of protocols that solve cryptographic problems involving quantum data and quantum communication.
Recent progress in building quantum computers lead to new opportunities for cryptography, but also endangers existing cryptographic schemes. I will survey both aspects of this double-edged sword: On the one hand, a large-scale quantum computer will be able to quickly factor large integer numbers, thereby breaking the security of currently used public-key encryption. The research area of “post-quantum cryptography” investigates the possibilities for replacing currently used classical (i.e. non-quantum) cryptography with quantum-secure variants. On the other hand, quantum computers introduce new security scenarios such as the secure delegation of a quantum computation to an untrusted server (in the quantum cloud) without compromising the privacy of the input data.
This talk took place on April 3rd, in Landing Festival Berlin 2019. Find out more at https://landingfestival.com/