Warm up We are given 2 files: chall.py #!/usr/bin/env python3 from Crypto.Cipher import AES from Crypto.Util.Padding import pad, unpad import os from secret import flag class ByteHolder(): def __init__(self, b=0): assert 0 <= b <= 255

Damn this challenge name, I kept writing my name instead of "cotan" Shit. Solution By some magic, @196 is able to convert the base to traditional DLP problem p = 1361129467683753853853498429727072846149 g = 937857192022401732022326285294515252367 h = 71727917161216204087973385053390831556 Let's factor order of the group p: sage:

All files can be found here. OANHBOT Given files: oanhbot, libc-2.23.so. The binary has: Partial RELRO, Canary found, NX enabled and No PIE. Functionalities In this program, you will name your hero and choose an enemy to fight with and decide who

Note from Visit to Tianjin and Bejing, China PQC: Post-Quantum Cryptography Tianjin - Attending FPT conference, where a lot of papers in FPGA technique will become obsolete when the transistor size decreases. (meaning the resources in FPGA become double, turn out, no reason to

Mình không hoàn thành bài này trong thời gian thi và cũng không nhớ bài này có cho libc hay không nên ở writeup này mình sử dụng libc2.27, hệ điều hành Ubuntu 18.04 Checksec: Arch: amd64-64-little RELRO: Full RELRO Stack: No

In this writeup, I only show the solution how to solve the challenge, I didn't solve the challenge actually, because challenge itself was so boring. I've been away from CTF for quite a long time, due to my busy research work and healthy work-life

On 3rd November 2019, me and my team joined the SVATTT (Asean Student Contest on Information Security) qualification round. We joined in under the name "noobiens" and luckily ranked second in the South region. This is our writeup to the reversing challenge

Challenge: Link Bài này cho ta 1 file PE và 1 file xml. Mở file xml lên coi mình thấy có nhắc đến SEHOP <SEHOP Enable="false" TelemetryOnly="false" /> Qua tìm hiểu trên mạng mình biết được đây là 1 mitigation để

Sơ lược về std::string Những phiên bản libstdc++ gần đây thì có sử dụng kỹ thuật small string optimization. Đối với chuỗi có độ dài nhỏ hơn hoặc bằng 15 (không tính null byte), chuỗi được lưu tại buffer ngay trong cấu trúc.

Today I went to XSEDE Big Data Training, for short, this training is introduction to Big Data and what's going on at HPC (High Performance Cluster), where many critical computation are happening, some are national problem, some are billion dollar problem. Whenever I want