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Breaking Ciphers

I'm griin, a cryptography student; This is my blog !!

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Writeups

1 challenge

Step by step solutions. Exploit Implementation code included.

  • latticeMedium

    Brunner CTF 2k26 - Shredded Recipe

    Solving linear systems with lattices

    x = bytes_to_long(flag[0::3])
y = bytes_to_long(flag[1::3])
z = bytes_to_long(flag[2::3])
a, b, c = (random.randint(2, p) for _ in range(3))
d = (a*x + b*y + c*z) % p
print(a, b, c, d)
    Brunner CTF 2026

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Who am I

$ whoami
griin, cryptography student
$ cat interests.txt
Applied Cryptography, CTF, lattices
$ ls contacts/
githubctftimelinkedinemail