Personal portfolio and CTF writeup archive of Faiza (FAZer0), Informatics Engineering student at Universitas Brawijaya specializing in Reverse Engineering and Digital Forensics.https://fazer0.dev/en-ushttps://fazer0.dev/writeups/gemastik-19-ctf-quals/https://fazer0.dev/writeups/gemastik-19-ctf-quals/Penyisihan GEMASTIK XIX 2026 writeup covering custom binary token decoding (common-encoding), discrete logs, memory triage, and bitmap reverse engineering.Fri, 21 Aug 2026 00:00:00 GMTcryptocustom-encodingdiscrete-logarithmnonce-reuseforensics-pcapdot-matrix-reversehttps://fazer0.dev/writeups/hib-chb-finals-2026/https://fazer0.dev/writeups/hib-chb-finals-2026/Solutions for HIB CHB Finals 2026: Android storage forensic triage with OpenSSL AES-256-CBC and headless Python 3.11 bytecode repair and cracking.Sun, 16 Aug 2026 00:00:00 GMTforensicsandroid-forensicstermux-triageaes-256-cbcpyc-magic-headerpylingualreverse-engineeringhttps://fazer0.dev/writeups/hib-chb-quals-2026/https://fazer0.dev/writeups/hib-chb-quals-2026/Detailed breakdown of HIB CHB Quals 2026 covering Keras bytecode deserialization, disk timeline triage with AES-256 decryption, and binary patching with anti-debugging bypass.Tue, 11 Aug 2026 00:00:00 GMTreversekeras-deserializationpython-bytecodedisk-forensicsanti-debuggingbinary-patchingaes-cbchttps://fazer0.dev/writeups/techfest-2026-finals/https://fazer0.dev/writeups/techfest-2026-finals/Dissecting an Android malware dump, decompiling APK Smali bytecode to extract AES-CBC crypto keys, and carving device metadata to unlock exfiltrated credentials.Mon, 27 Jul 2026 00:00:00 GMTforensicsandroid-malwareapk-reversesmali-analysisfile-carvingaes-cbchttps://fazer0.dev/writeups/techfest-2026-quals/https://fazer0.dev/writeups/techfest-2026-quals/Walkthrough of TECHFEST 2026 Quals featuring DisplayPort raw signal packet carving (DpDp), custom cryptography vaults, and sandbox escapes.Thu, 09 Jul 2026 00:00:00 GMTforensicsdisplayport-pcapraw-rgb-reconstructionvault-heistreverse-engineeringsandbox-escapehttps://fazer0.dev/writeups/cyber-wave-2-0/https://fazer0.dev/writeups/cyber-wave-2-0/Comprehensive solutions for Cyber Wave 2.0 CTF: Matryoshka nested multi-cipher breaking, binary analysis, covert network triage, and open-source intelligence operations.Sat, 02 May 2026 00:00:00 GMTcryptomatryoshka-encryptionchacha20-poly1305pbkdf2osint-geointreverse-engineeringhttps://fazer0.dev/writeups/freepass-poros-2026/https://fazer0.dev/writeups/freepass-poros-2026/Master writeup covering all 7 categories from Freepass POROS 2026: Cloud AWS triage, advanced RSA cryptanalysis, memory packet triage, pwn, and reverse engineering.Wed, 18 Feb 2026 00:00:00 GMTreversemulti-categorybinary-exploitationcloud-securitycryptanalysismemory-forensicshttps://fazer0.dev/writeups/arkavidia-10-neuralcipher/https://fazer0.dev/writeups/arkavidia-10-neuralcipher/Reversing a linear algebraic neural network cipher by computing matrix inversion modulo 256 using Gauss-Jordan elimination.Sun, 01 Feb 2026 00:00:00 GMTreverseneural-networkmatrix-inversionmodular-arithmeticpython-bytecodelinear-algebrahttps://fazer0.dev/writeups/ncw-binus-2025-wassup-twin/https://fazer0.dev/writeups/ncw-binus-2025-wassup-twin/Breaking custom unpadded RSA with small twin prime modulus where message size exceeds modulus (m > N) via modular reduction recovery and prefix filtering.Mon, 24 Nov 2025 00:00:00 GMTcryptorsa-cryptographytwin-primeunpadded-rsamodular-arithmeticbrute-force-khttps://fazer0.dev/writeups/codex-ctf-2025/https://fazer0.dev/writeups/codex-ctf-2025/Solutions for CODEX CTF 2025: Hastad's broadcast attack with CRT (e=3), parallelized 24-bit keystream search, and dynamic core dump memory analysis.Sat, 15 Nov 2025 00:00:00 GMTcryptohastad-broadcast-attackchinese-remainder-theoremmultiprocessing-keystreamrot47core-dump-analysis