40 points，512 solves

題目給的一串東西叫我們解XOR然後他有題示

The key is 5 bytes long and the flag is somewhere in the message.

ae27eb3a148c3cf031079921ea3315cd27eb7d02882bf724169921eb3a469920e07d0b883bf63c018869a5090e8868e331078a68ec2e468c2bf13b1d9a20ea0208882de12e398c2df60211852deb021f823dda35079b2dda25099f35ab7d218227e17d0a982bee7d098368f13503cd27f135039f68e62f1f9d3cea7c

我們直接用 https://www.dcode.fr/xor-cipher  這個網站解密

在Text to be XORed (multiplied by XOR)貼上題目，下面選擇Knowing the key size (in bytes)後面打5，按下encrypt/decrypt 旁邊就顯示答案了

Congratulations on decrypting the message! The flag is actf{who_needs_aes_when_you_have_xor}. Good luck on the other crypto!