Incognito wtfCTF 2021: wtf_B0T

wtf_B0T

Category: Crypto

chal

50 points

Join the discord server!You know how to ask bot for flag or help. Don’t you?

Author: madjelly

Solution

I was wondering why this is Crypto challenge, but when I checked the Discord everything became clear.

discord1

discord2

Vigenere cipher was my first guess, but despite my suspicious it took me a while to get the flag ;-)

For decryption I used my favourite site with ciphers -> https://www.dcode.fr/vigenere-cipher

dcode1

I’ve started with attempt to decrypt the key by attempting to decrypt the whole with known wtfCTF prefix. IAMGRO unfortunately wasn’t the complete key (that’s why it took me a while), but finally I’ve realized that correct key is IAMGROOT, which gave me below.

dcode2

Flag

wtfCTF{D15c0rd_B0t_m4st3r}

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