DMI, Spiegelgasse 5, 4051 Basel Seminarraum 05.002

## Perlenkolloquium: Prof. Dr. Joachim Rosenthal (UZH)

**Towards a Standardization in Post-Quantum Cryptography**

Public key cryptography has been at the center of modern cryptography. It is not only used for the exchange of secret keys but also for the authentication of entities on the Internet, for digital signatures and for the construction of digital currencies.

Until a few years ago most public key systems were based on the hardness of factoring integers or on the hardness of the discrete logarithm problem in an elliptic curve.

With the realization that a quantum computer would make many practically used public key cryptographic systems obsolete it became an important research topic to design public key systems which are expected to be secure even if a powerful quantum computer would exist.

This new area of research is called post-quantum cryptography and there has been in the last couple of years a lot of efforts to come up with new standards to be used in everyday applications.

The main part of the lecture will overview this recent development and will explain the underlying mathematical problems.

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