We solved the 0-solve hard web challenge checkin after CyBRICS CTF 2021 and claimed a reward. Here is our writeup.
Writeup for Writeup for bfv and PSN in 2021qwb Final (2021-07-10 09:00 +30h).
- bfv: chosen-ciphertext attack on bfv homomorphic encryption algorithm
- PSN: weak key
a proactive approach to security research on cryptographic protocols
some articles that inspire me
Shadowsocks is a famous software used for circumventing the GFW. Recently, some security issues of Shadowsocks were exposed, due to the lack of security awareness of the developers when they use some cryptographic components.
This post begins with the analysis of the source code, based on which a practice of packet capturing is conducted. Finally, a security analysis of the vulnerability, as well as a reproduction is given,.
Solved 2 interesting challenegs in Real World CTF 2020/2021 (2021-01-09 10:00 +48h). And here is my writeup.
Some places where I went around, and some pictures that record these journeys.
Writeup for 3 crypto challenges in 2020 X-NUCA (2020-10-30 09:30 +36h).