Silky - CryptoCTF - writeup

Sat, 27 Dec 2025 00:00:00 +0000

In this challenge, we are given the file Silky.sage. It starts by generating some parameters:

def randroad(B):
	return vector(ZZ,[randint(-B, B) for _ in range(n)])

def main():
    global flag, B, n, D, t
    B, n = 5, 19
    D, t = 110, 128
    l = int(4 * D * B / t)
    c, key = 0, randroad(B)

In particular, it generates a key that is a vector of length 19 with integer values in $[-5, 5]$.

Then, this is the main loop of the challenge:

LWE on manbolq's Blog

Silky - CryptoCTF - writeup