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Quantum computers have been widely discussed since the 1980s. Even though very few people have dealt with them by now, such devices steadily become a harsh reality threatening traditional cryptography. In response to this threat, computer engineers have developed post-quantum encryption algorithms. In this article, I will show how these algorithms are applied in OpenVPN and will give an overview of the current situation in the world of quantum technologies.

Contactless payment cards are very convenient: you just tap the terminal with your card, and a few seconds later, your phone rings indicating that the transaction is completed. But this convenience has a downside: malefactors can steal money from such cards. This article provides an overview of methods used to hack NFC (near-field communication) payment cards.

Each aspiring pentester or information security enthusiast wants to advance at some point from reading exciting write-ups to practical tasks. How to do this in the best way and what should you pay attention to in the first place? In this article, I will describe my own pentesting journey and share some of my findings.

Once you have got a shell on the target host, the first thing you have to do is make your presence in the system ‘persistent’. In many real-life situations, you have only one RCE attempt and cannot afford losing access due to some unexpected event.

If you had ever administered a server, you definitely know that the password-based authentication must be disabled or restricted: either by a whitelist, or a VPN gateway, or in some other way. We decided to conduct an experiment and check what happens if this simple step isn’t taken.