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Apr 17, 2022

DCTF 2022 MACdonalds 1 and 2 Solutions

Preface In the writeup I assume that readers are familiar with basic cryptographic terms such as AES, modes of encryption, MAC, etc. Also, I assume that readers can read and understand the servers’ source code. So I will only concentrate on the high-level parts of the solution. …

Ctf

5 min read

DCTF 2022 MACdonalds 1 and 2 Solutions
DCTF 2022 MACdonalds 1 and 2 Solutions
Ctf

5 min read


Feb 11, 2022

[Cryptohack] Logon Zero write up

This article continues the series of challenges write ups from Cryptohack. This time we are going to look at the vulnerability in AES-CFB8 which lays in the heart of Logonzero vulnerability (CVE-202–1472). I will explain the essentials, but if you feel like you need some more details, read this paper. …

Crypto

4 min read

[Cryptohack] Logon Zero write up
[Cryptohack] Logon Zero write up
Crypto

4 min read


Feb 7, 2022

[Cryptohack] Triple DES solution

For this challenge we are provided with the source code for the API we can use:

Crypto

5 min read

[Cryptohack] Triple DES solution
[Cryptohack] Triple DES solution
Crypto

5 min read


Dec 12, 2021

niteCTF 2021, Flip Me Over Writeup

We have the server source code and its network address. As usual, let’s examine the code: So the server allows us to perform two operations: generate token and verify token. …

Ctf

3 min read

niteCTF 2021, Flip Me Over Writeup
niteCTF 2021, Flip Me Over Writeup
Ctf

3 min read


Dec 12, 2021

niteCTF 2021, Rabin to the Rescue Writeup

Description So we have the server’s network address and the source code. Let’s examine the source code: First, this code generates two primes p and q. The generation function is pretty interesting: It sets p to 256-bit prime and q to p + 6 and then checks if p =…

Ctf

6 min read

niteCTF 2021, Rabin to the Rescue Writeup
niteCTF 2021, Rabin to the Rescue Writeup
Ctf

6 min read


Nov 28, 2021

Dragon CTF 2021, Baby MAC Writeup

For challenge we are provided with the server network address and its source code. Consider the source code: Here is the essentials of the source: There are two operations it can perform: sign and verify sign operation takes some hex string data as an input, calculates its signature and…

Crypto

4 min read

Dragon CTF 2021, Baby MAC Writeup
Dragon CTF 2021, Baby MAC Writeup
Crypto

4 min read


Nov 28, 2021

ISITDTU CTF 2021, ONE TIME BEACH Writeup

For this challenge we are provided with a source code one_time_beach.py and an encrypted file cipher.enc. Also we have a hint that the…

Ctf

5 min read

ISITDTU CTF 2021, ONE TIME BEACH Writeup
ISITDTU CTF 2021, ONE TIME BEACH Writeup
Ctf

5 min read


Nov 14, 2021

Pascal RSA Writeup. K3RN3L CTF

Foreword K3RN3L CTF was really cool this year, there were a lot of fascinating crypto challenges. Too bad, I was busy this weekend, so I only took a brief view on a couple of them and solved just one, which is the challenge I’m going to explain. Challenge description So we are given…

Ctf

4 min read

Pascal RSA Writeup. K3RN3L CTF
Pascal RSA Writeup. K3RN3L CTF
Ctf

4 min read


Nov 1, 2021

Hack.lu CTF 2021, Silver Water Industries Writeup

Analyzing the code For this challenge we are provided with the server network address and the source code: Let’s first look at the main function. It first generates some two values N and token. Then it prints us the N and each byte of the token encrypted by function encryptByte(b, N). After…

Ctf

5 min read

Hack.lu CTF 2021, Silver Water Industries Writeup
Hack.lu CTF 2021, Silver Water Industries Writeup
Ctf

5 min read


Sep 27, 2021

Break Me!, DownUnder CTF 2021, Writeup

For this task we have the server source code and the server address. Let’s look inside the source code

Ctf

6 min read

Break Me!, DownUnder CTF 2021, Writeup
Break Me!, DownUnder CTF 2021, Writeup
Ctf

6 min read

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0awawa0

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