Stranger's CTF 2026 - Grid
Challenge Information Name: Grid Category: Forensics Difficulty: Easy Description: Easy once you figure out the trick :) Initial Analysis The provided file (1f407) does not have a recognizable extension. Running basic file identification tools does not immediately reveal its format. However, attempting to load it with NumPy works: import numpy as np arr = np.load("1f407") print(arr.shape) Output: (484, 484) This indicates the file is a NumPy array. Observations The array is square (484 × 484). Values are in the set { -1, 0, 1 } and the matrix is symmetric with a zero diagonal ...