This challenge gave me nothing but a set of coordinates, the type used in graphing. The file was named qr.txt, which gave me the idea that they would be used in a qr code. I wrote a python script to put together the qr code
import numpy as np
import matplotlib.pyplot as plt
check = np.zeros((29, 29)) # Max number from each x,y
c = [(22, 25), (14, 9), (11, 14), (2, 13), (23, 4), (12, 27), (15, 0), (23, 28), (22, 10), (21, 21), (20, 15), (20, 5), (23, 1), (24, 8), (13, 0), (5, 27), (19, 4), (0, 20), (20, 13), (15, 11), (27, 18), (23, 23), (15, 8), (27, 12), (21, 0), (1, 26), (16, 0), (8, 17), (18, 2), (14, 1), (13, 14), (3, 27), (19, 10), (7, 16), (6, 15), (17, 3), (9, 13), (27, 16), (16, 28), (15, 20), (19, 14), (18, 13), (8, 15), (8, 25), (18, 8), (21, 19), (3, 12), (8, 26), (20, 8), (11, 22), (7, 21), (9, 17), (17, 18), (19, 8), (21, 8), (28, 16), (23, 15), (19, 3), (23, 25), (11, 25), (19, 2), (27, 7), (17, 1), (14, 12), (3, 23), (17, 26), (9, 10), (10, 22), (16, 8), (3, 8), (24, 18), (2, 27), (4, 27), (27, 14), (21, 3), (6, 12), (7, 2), (23, 26), (14, 2), (27, 10), (18, 20), (26, 25), (3, 20), (5, 2), (24, 5), (9, 21), (2, 21), (23, 22), (12, 22), (2, 1), (7, 5), (16, 12), (11, 15), (21, 22), (12, 4), (7, 4), (21, 7), (21, 1), (28, 20), (5, 14), (11, 13), (3, 7), (4, 1), (1, 24), (19, 13), (19, 26), (0, 12), (10, 28), (23, 18), (10, 10), (26, 20), (11, 21), (14, 20), (27, 5), (19, 19), (11, 1), (9, 4), (25, 7), (4, 10), (25, 16), (10, 4), (14, 17), (10, 17), (5, 16), (28, 12), (17, 17), (7, 28), (8, 7), (21, 23), (26, 28), (26, 19), (0, 17), (8, 11), (28, 11), (1, 20), (21, 18), (7, 0), (0, 16), (12, 14), (17, 5), (10, 18), (9, 19), (26, 9), (12, 3), (18, 24), (23, 3), (18, 22), (27, 2), (2, 8), (24, 15), (21, 12), (9, 26), (7, 14), (9, 11), (21, 11), (19, 6), (26, 18), (13, 23), (21, 27), (18, 26), (24, 1), (23, 5), (22, 7), (1, 27), (1, 4), (7, 26), (18, 9), (27, 4), (19, 18), (23, 2), (23, 19), (17, 9), (28, 24), (12, 1), (27, 22), (14, 11), (20, 0), (13, 9), (3, 5), (0, 14), (5, 9), (12, 11), (10, 26), (1, 2), (27, 3), (13, 7), (27, 15), (10, 25), (7, 27), (25, 22), (26, 1), (10, 13), (27, 11), (6, 9), (11, 4), (2, 7), (16, 16), (11, 9), (12, 8), (2, 17), (16, 22), (9, 2), (11, 17), (23, 11), (7, 15), (16, 23), (24, 14), (1, 12), (5, 5), (5, 11), (25, 1), (4, 15), (18, 11), (11, 12), (4, 9), (26, 7), (13, 25), (25, 5), (22, 16), (15, 23), (9, 12), (20, 4), (27, 19), (0, 11), (5, 23), (22, 21), (12, 2), (6, 21), (26, 24), (24, 26), (13, 22), (7, 24), (28, 7), (5, 7), (22, 23), (16, 14), (25, 18), (26, 11), (10, 7), (9, 5), (19, 28), (9, 6), (1, 21), (10, 24), (0, 15), (18, 16), (7, 17), (19, 0), (14, 14), (26, 15), (8, 22), (27, 17), (23, 21), (16, 26), (4, 23), (18, 28), (7, 22), (5, 25), (1, 3), (22, 8), (15, 5), (22, 27), (14, 22), (23, 10), (5, 15), (7, 18), (14, 19), (20, 26), (13, 1), (14, 27), (18, 12), (9, 18), (16, 10), (28, 28), (20, 10), (5, 1), (23, 7), (26, 23), (0, 7), (9, 8), (26, 12), (2, 9), (5, 19), (10, 8), (13, 3), (5, 3), (11, 20), (12, 19), (1, 13), (26, 5), (9, 20), (26, 16), (1, 15), (10, 19), (20, 25), (15, 1), (10, 15), (22, 12), (1, 14), (4, 14), (20, 9), (5, 24), (2, 19), (15, 3), (25, 24), (21, 6), (19, 11), (15, 12), (2, 10), (19, 17), (21, 26), (6, 11), (13, 17), (24, 16), (8, 18), (24, 19), (7, 19), (12, 21), (6, 7), (21, 5), (1, 1), (8, 8), (1, 5), (5, 21), (11, 7), (17, 12), (7, 6), (12, 16), (18, 17), (2, 23), (7, 7), (10, 5), (5, 26), (16, 11), (3, 21), (16, 3), (15, 25), (5, 4), (9, 23), (1, 11), (15, 16), (1, 25), (21, 4), (2, 14), (12, 24), (9, 14), (17, 4), (17, 14), (27, 25), (11, 0), (24, 25), (19, 15), (20, 17), (4, 5), (7, 8), (13, 15), (2, 15), (7, 23), (8, 4), (6, 13), (11, 23), (12, 13), (16, 7), (27, 21), (13, 6), (7, 11), (15, 6), (1, 9), (1, 23), (7, 3), (25, 21), (16, 2), (7, 1), (8, 12), (6, 19), (2, 5), (10, 3), (25, 17), (27, 1), (14, 28), (21, 2), (26, 27), (4, 21), (3, 1), (14, 25), (10, 20), (26, 10), (11, 28)]
for each in c: # For each coordinate
check[each[0]][each[1]] = 1 # Set it to one
plt.imshow(check, cmap='gray', interpolation='nearest')
plt.axis('off') # Don't interfere with the code
plt.show()And sure enough the out put was a perfect qr code
Now we just need to scan it using this
| Raw text | easyctf{bet_y0u_read_that_wiki_page} |
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| Raw bytes | 42 46 56 17 37 96 37 46 67 b6 26 57 45 f7 93 07 55 f7 26 56 16 45 f7 46 86 17 45 f7 76 96 b6 95 f7 06 16 76 57 d0 ec 11 |
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