https://yurichev.com/blog/ by Dennis Yurichev https://yurichev.com/blog/linkedin/ My new linkedin profile Thu, 05 Mar 2026 00:00:00 +0100 https://yurichev.com/blog/xorshift/ [SMT][Z3] Predicting Math.random() in Firefox using Z3 SMT-solver Mon, 02 Feb 2026 00:00:00 +0100 https://yurichev.com/blog/writing/ Hire an author/writer Thu, 29 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/SSH6/ [Crypto] Toy SSH client in ~2k SLOC of Python, v6 Tue, 20 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/password_req/ [Math][Pentesting] Password requirements are harmful. A password with required digit/special character may be weaker. Part II. Mon, 12 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/fuzzy_topo_sort/ [RevEng][CS] Fuzzy topological sorting Fri, 09 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/PIC/ IOCCC/mullender revisited, position-independent code, shellcode Mon, 05 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/LS/ Hunting for extremal Latin squares using MaxSAT solver Thu, 01 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/reset/ [RevEng][x86][x64][C][newbies] Software reset in embedded devices Thu, 01 Jan 2026 00:00:00 +0100 https://yurichev.com/blog/wc/ Testing word counting code using KLEE and CBMC Thu, 25 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/intervals_open_fence/ [Math] Intervals: examples of open intervals; fencepost errors Fri, 19 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/intervals_maven/ [Math] Intervals: Apache Maven version numbers Fri, 19 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/intervals_half_open/ [Math] Intervals: examples of half-open intervals Thu, 18 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/intervals_closed/ [Math] Intervals: examples of closed intervals Thu, 18 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/cartesian/ [Pentesting][Math] Bruteforce passwords using cartesian product Thu, 18 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/hashcat_masks/ [Pentesting][Math] Finding masks for Hashcat using combinatorics Mon, 15 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/mqtt/ What is MQTT (IoT, smart homes) --- an explanation under 120 lines or 1100 words Thu, 11 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/ethernet/ [Math] Number of ways to insert 4 wires into 8-pin 8P8C Ethernet connector Tue, 09 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/flatten/ Flatten function/operation in functional programming Mon, 08 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/symlink/ [Unix][C] Similarities between Unix symlinks and C/C++ pointers/references Thu, 04 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/dahua/ [Pentesting] Dahua (CCTV cameras) auth Tue, 02 Dec 2025 00:00:00 +0100 https://yurichev.com/blog/ONVIF/ [Pentesting] ONVIF (CCTV cameras) auth Fri, 28 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/RTSP_auth/ [Pentesting] RTSP (CCTV cameras) auth Mon, 24 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/HTTP_auth_3/ [Pentesting] HTTP auth, part III: rogue web-server Fri, 21 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/HTTP_auth_2/ [Pentesting] HTTP auth, part II: digest Fri, 21 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/HTTP_auth_1/ [Pentesting] HTTP auth, part I: basic Fri, 21 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/passwords_from_wikipedia/ [Pentesting] Passwords from Wikipedia Fri, 21 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/receipts/ [RevEng] Challenge: Ukrainian receipts: the solution Thu, 20 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/toy_decompiler/ [RevEng] Toy decompiler Mon, 17 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/walking/ [Pentesting] Walking passwords, part II Thu, 13 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/wifi/ [Pentesting] The cost of cracking WPA2 (Wi-Fi) passwords in 2025 Thu, 13 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/entropy/ Two more uses of information entropy metric Mon, 10 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/XOR/ Yet another XOR feature: a lamp turned on/off with several toggle switches Mon, 10 Nov 2025 00:00:00 +0100 https://yurichev.com/blog/undelete/ Recovering/undeleting short deleted files in 50 SLOC of pure C, any filesystem supported. Tue, 14 Oct 2025 00:00:00 +0200 https://yurichev.com/blog/linux_strings/ Linux kernel compressed files have some text strings Thu, 02 Oct 2025 00:00:00 +0200 https://yurichev.com/blog/oracle/ Oracle zero-day vulnerability for sale Thu, 18 Sep 2025 00:00:00 +0200 https://yurichev.com/blog/CBC_IV/ [Crypto] Leaking IV in CBC mode Tue, 16 Sep 2025 00:00:00 +0200 https://yurichev.com/blog/qsort/ Yet another explanation of the Quicksort algorithm Sat, 23 Nov 2019 00:00:00 +0100 https://yurichev.com/blog/bak/ [Linux] Simplest possible snapshot-style backups using rsync Wed, 16 Oct 2019 00:00:00 +0200 https://yurichev.com/blog/SA_XOR/ Cracking simple XOR cipher with simulated annealing Sun, 21 Jul 2019 00:00:00 +0200 https://yurichev.com/blog/students/ Packing students into dorm using simulated annealing Fri, 28 Jun 2019 00:00:00 +0200 https://yurichev.com/blog/cabling/ Make shortest cables in your rack using simulated annealing Thu, 27 Jun 2019 00:00:00 +0200 https://yurichev.com/blog/malbolge/ Generating Malbolge code using simulated annealing Wed, 26 Jun 2019 00:00:00 +0200 https://yurichev.com/blog/weird_sort_KLEE/ Worst sorting algorithm I ever saw: proving it using KLEE Wed, 25 Jul 2018 00:00:00 +0200 https://yurichev.com/blog/LCG/ Cracking simple LCG PRNG Thu, 02 Mar 2017 00:00:00 +0100 https://yurichev.com/blog/CAS/ Content-addressable storage Sun, 27 Sep 2015 00:00:00 +0200 https://yurichev.com/blog/typeless/ Typeless programming languages (BCPL, B), C evolution and decompiling Tue, 08 Sep 2015 00:00:00 +0200 https://yurichev.com/blog/fuzzy_string/ Fuzzy string matching + simplest possible spellchecking + hunting for typos and misspellings in Wikipedia Thu, 23 Jul 2015 00:00:00 +0200 https://yurichev.com/blog/llvm/ Tweaking LLVM Obfuscator + quick look into some of LLVM internals Sat, 16 May 2015 00:00:00 +0200 https://yurichev.com/blog/58/ Making C compiler generate obfuscated code Tue, 07 Dec 2010 00:00:00 +0100