2110, 2025

DeepSec 2025 Talk: Quantum Safe Cryptography: The Future of Cyber(un)security – Lukas Mairhofer

Sanna/ October 21, 2025/ Conference/ 0 comments

There is a cybersecurity threat looming that will change everything. Conveniently enough, it can be ignored until it is way too late to act: once available, Cryptographically Relevant Quantum Computers (CRQC) will effortlessly break asymmetric cryptographic algorithms such as RSA and ECC on which we build our current security infrastructure. In my talk, I will first discuss what makes Quantum Computers uniquely powerful, translating complex physical concepts into practical implications for cybersecurity. We will explore how Shor’s algorithm undermines current cryptographic assumptions and why digital signatures and public key infrastructures are particularly vulnerable. Attendees will gain an overview of the timeline for the development of CRQC, the principal actors in the field and why CRQC endangers our privacy already today. The session will then turn to mitigation strategies, exploring two promising paths: Quantum Key

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2608, 2022

DeepSec 2022 Talk: Post-quantum Verkle Signature Scheme – Maksim Iavich

Sanna/ August 26, 2022/ Conference

We expect mass production of quantum computers in the near future. Quantum computers can easily break cryptographic schemes that are used in practice. Thus, classical encryption systems become vulnerable to attacks using quantum computers. There are research efforts to find encryption schemes that are resistant to attacks using quantum computers. Digital signatures are an important technology in securing the Internet and other IT infrastructures. A digital signature provides the authenticity, integrity, and identification of data. We use digital signatures in identification and authentication protocols. So, these secure digital signature algorithms are crucial in terms of IT security. Today, in practice, digital signature algorithms such as RSA, DSA, ECDSA are used. However, they are not quantum stable, as their safety relies on large composite integers, complex factorization and the computation of discrete logarithms. We asked

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1310, 2021

DeepSec 2021 Talk: Post-quantum Encryption System for 5G – Maksim Iavich

Sanna/ October 13, 2021/ Conference

Nowadays, many leading scientists and experts are actively working on the creation of quantum computers. On October 23 2019, Google announced that it has achieved quantum supremacy. This means the great speedup of the quantum processors compared to the fastest classic computer. On December 06 2020, scientists in China also announced that they also achieved quantum supremacy. Quantum computers will probably destroy most cryptosystems that are widely used in practice. A variety of “resistant to quantum attacks,” alternatives are developed. These alternatives are hash-based, code-based, lattice-based and multivariate crypto schemes. However, to date a number of successful attacks is recorded on the given system. It is also shown that these schemes have efficiency problems. The amount of traffic carried over wireless networks and the number of mobile devices (including IoT) are growing rapidly and

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2509, 2020

DeepSec 2020 Talk: Efficient Post-quantum Digital Signature – Maksim Iavich (DeepSec Scholar 2020)

Sanna/ September 25, 2020/ Conference

Active work is being done to create and develop quantum computers. Traditional digital signature systems, which are used in practice, are vulnerable to quantum computers attacks. The security of these systems is based on the problem of factoring large numbers and calculating discrete logarithms. Scientists are working on the development of alternatives to RSA, which are protected from attacks by quantum computer. One of the alternatives are hash based digital signature schemes. Merkle digital signature scheme is the very promising alternative to the classical digital signature schemes. It must be emphasized, that the scheme has efficiency problems and can not be used in practice. Major improvements of the scheme lead to security vulnerabilities. I will show that Merkle uses hash functions many times. I will offer the improved implementation of the hash function. I

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