https://icedev.pl/ A minimal, portfolio, sidebar, bootstrap Jekyll theme with responsive web design and focuses on text presentation. 2026-06-07T00:21:36+02:00 Michał Leszczyński https://icedev.pl/ Jekyll © 2026 Michał Leszczyński /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2023-03-25T00:00:00+01:00 2025-10-27T00:00:00+01:00 https://icedev.pl/posts/setting-up-ev-code-signing-google-hsm-fips-140-2/ Michał Leszczyński

Many Certificate Authorities had recently tightened the requirements for using EV Code Signing Certificates. The industry standard is now that you need to either host your certificate’s private key on a physical USB token, or you can load it to the compliant Hardware Security Module (HSM). However, using a USB dongle would cause a lot of struggle with the modern Continuous Integration pipelines...

2018-03-26T00:00:00+02:00 2018-03-26T00:00:00+02:00 https://icedev.pl/posts/processor-hacking/ Michał Leszczyński

“Processor hacking” blog post series recently published on “Zaufana Trzecia Strona” is an attempt to show a logical string between processor optimizations and existence of Meltdown and Spectre attacks. As per now, these articles are available only in polish. Special thanks for Jarosław Jedynak and Michał Purzyński for their contribution in these articles. Part 1: Processor optimizations (PL...

2017-12-20T00:00:00+01:00 2017-12-20T00:00:00+01:00 https://icedev.pl/posts/adjacency-list/ Michał Leszczyński

Today I was asked via IRC about how to implement adjacency list in C. My idea and implementation will be shown below. Suppose that we want to keep adjacency information of $N$ vertices (numbers from the set \([0, N-1]\)). We also want to be able to check if pair of vertices \((x, y)\) is adjacent. Note that \((5, 3)\) is exactly the same as \((3, 5)\), so we may perform optimization here by as...

2017-12-12T00:00:00+01:00 2017-12-12T00:00:00+01:00 https://icedev.pl/posts/przelewy24/ Michał Leszczyński

Przelewy24 is a polish payment gateway service. Recently I’ve discovered major security problems in their official libraries dedicated for Android, iOS and Windows Phone. The original text (in polish language) was published via Zaufana Trzecia Strona as: “Biblioteka która zapisuje login i hasło do banku i przechwytuje wasze SMSy”.

2017-12-03T00:00:00+01:00 2017-12-03T00:00:00+01:00 https://icedev.pl/posts/door-lock/ Michał Leszczyński

Few days ago I’ve seen that one company is producing a strange kind of electronic door handles. Such devices could be unlocked by inputting a correct PIN code using a classical 10-digit keyboard. The solution is mainly suited for short-term apartment rentals in order to address the problem of key delivery - such rental company usually has from a few to several dozen of houses spread across the ...