All my friends have been getting into genshin and honkai recently and keep sending me pictures. However, they keep hiding their favorite characters, demanding for more money for their gacha pulls.
Can you free zhongli my waifu???
We're given three PNG files:
owo.png
uwu.png
fiscl.png
The last one seems unrelated, but the first two are reminiscent of IslandParty. Writing a script to diff them and view the channels,
import cv2
owo = cv2.imread('owo.png')
uwu = cv2.imread('uwu.png')
res = owo - uwu
cv2.namedWindow('image', cv2.WINDOW_NORMAL)
cv2.imshow('image', res)
cv2.waitKey()
(see any letters in the middle row?)
Amplifying the contrast a bit, we can make out a few more letters and...
...is that a x0r at the end of the flag?
XOR'ing the images together, we get the flag:
import cv2
owo = cv2.imread('owo.png')
uwu = cv2.imread('uwu.png')
res = owo ^ uwu
cv2.namedWindow('image', cv2.WINDOW_NORMAL)
cv2.imshow('image', res)
cv2.waitKey()
lactf{zh0ng_l7_x_ch7ld3_b4t_w7th_x0r}