Tags: rng crypto xor

Rating:

1. Read the hex value contents of out.txt.
2. Generate the pseudo-random key by using the same seed 13371337.
3. XOR the contents of out.txt with the generated key.
4. Write the XORed value onto flag.txt.
5. Represent the hex value of the key in ASCII using xxd.

Original writeup (https://kblagoev.com/blog/soulcrabber-cyberapocalypse-2021-ctf/).