The Department of Physics invites you to a lecture by Jaroslav Hercík
To mark International Quantum Day, the Department of Physics invites you to a lecture by Jaroslav Hercík titled “Long-Term Trustworthiness of Electronic Documents in the Era of Quantum Computers.”
The lecture will take place on April 16, 2026, at 1:00 PM in Auditorium 1.01 (CPTO) and will present practical implications for digital signatures, time stamping, and document integrity, as well as the current state of quantum computer development.
The lecture is an official part of the International Quantum Day program, making Ústí nad Labem one of the quantum cities across the globe. The official day of celebration is April 14 (4/14), which refers to the rounded first digits of Planck’s constant (4.1356677×10−15 eV⋅s).
Abstract:
In debates about quantum computers, attention often focuses on encrypted communication. However, future quantum threats also impact long-term trust in electronic documents. The lecture will highlight practical implications for digital signatures, time-stamping, and document integrity. It will present the current state of quantum computer development and explain the significance of Shor’s algorithm for the security of asymmetric cryptographic systems in use today. It will further focus on electronic signatures and timestamps, their mathematical principles, and their importance for the trustworthiness of electronic documents under the eIDAS Regulation. Attention will be given to the security risks that quantum computers may pose in the areas of electronic signatures and long-term document time-stamping. In the concluding section, hash-based systems and Merkle trees will be briefly introduced as possible principles for a more long-term resilient solution.
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