27 de maio de 2025 · 424 palavras · 2 minutos
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CTF
Crypto
Two weeks ago (05/17), we (ELT) participated in MidNight Sun CTF 2025 Quals, a HackingForSoju’s annual CTF event to promote competition around the world. On this writeup, we will talk about a crypto chall, solved by Danilo (dant3) and Lucas (kyo).
Oldchall The challenge had the following description
ssh bionic@oldchall-wzmj3o9b.ctf.pro / Password: F33lOldY3t We posted the quals so much that this chall is straight from 2018. The initial step was to log in via ssh using the credentials provided, granting access to the challenge’s remote machine.
21 de maio de 2025 · 3208 palavras · 16 minutos
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CTF
Reversing
Crypto
More than one month has past since DEF CON Quals, but we were so exhausted by it only now we managed to put together this set of write-ups. This year, several CTF-BR affiliated teams united to form pwn de queijo (a pun with pão de queijo). Together, we managed to achieve top17, the best position achieved by a Brazilian team until now. Let’s keep training to get qualified to the Finals next year :D
12 de maio de 2025 · 3692 palavras · 18 minutos
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CTF
Reversing
This past weekend (05/09-05/11), we participated in DamCTF 2025, organized by the Oregon State University Security Club. On this writeup, first we will focus on two reverse engineering challenges: ‘Is it data or data?’ and ‘It’s data, not data’. They’re both related, in that they’re two different versions of a similar ‘game’, albeit with different rules and possible commands. You could say ’not data’ is a sequel to ‘or data?’, especially since the CTF admins recommended playing one after finishing the other.
15 de abril de 2025 · 3030 palavras · 15 minutos
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CTF
Reversing
Hardware
It has been a few weeks since we played WolvCTF 2025, but I’ve been longing to write about LockDown, a simple but fun hardware reverse engineering challenge.
The problem statement follows:
I’m trying to use this adder, but I can’t figure out what password gets it to work. Can you figure it out?
NOTE: to get the flag, convert the password bit-string into an ASCII string, with password[47] as the MSB and password[0] as the LSB.
17 de fevereiro de 2025 · 2922 palavras · 14 minutos
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CTF
O Epic Leet Team jogou o LA-CTF que ocorreu no final de semana do dia 08 até 09 de fevereiro. Os challenges de pwning foram resolvidos pelo professor orientador da frente de red team do projeto (com ocasionais ajudas de outros membros), e eu (Vini) embora com menos experiência, acompanhei a resolução dos desafios. Os challenges de crypto foram resolvidos pelo professor orientador, membros do ELT e a Laura, que no primeiro CTF dela resolveu um desafio e acompanhou as outras resoluções.
17 de fevereiro de 2025 · 2177 palavras · 11 minutos
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Virtualização
Redes
Qemu
Openvswitch
A virtualização é a tecnologia que permite rodar múltiplos sistemas operacionais ou aplicações em um único hardware, criando versões virtuais de servidores, redes ou armazenamento. Isso otimiza recursos, reduz custos e é a base da computação em nuvem.
