I heard the AES can be used as a safe permutation so my slider should be safe.
nc slider.eatpwnnosleep.com 6884
Use run.sh in deploy directory to run docker script
or simply run python3 slider.py
SCTF{Did_y0u_3nj0y_my_5lid3r?}
Note that given cipher has four round periocity so we can consider slide attack.
Dec : F2 - F0 - F1 - F0 - F2 - ... - F0 - F1 - F0 (1)
Enc : F0 - F1 - F0 - F2 - ... - F0 - F1 - F0 - F2 (2)
Dec : F2 - F0 - F1 - ... - F0 - f2 - F0 - F1 - F0 (3)
We can find k2 from (1) and (2) with 256 encryption and decryption by classic slide attack. Also we can find k0 and k1 ^ k2 from (2) and (3) with 256 encryption and decryption by combining complementation slide and sliding with a twist. You can see the detail at section 3.3 in link