ctf-writeup/2023/KnightCTF 2023/Hello

Hello

Sir vignere came to my dreams and sent me this packet capture and told me to find the flag from it which is the key to my success. I am a noob in these cases. So I need your help. Please help me find the flag. Will you?

About the Challenge

We were given a pcapng file and we need to open the file in wireshark

How to Solve?

If we open the file in wireshark and if we check on the DNS packet, there is a single character on each packet

After we arrange the character, here is the result

VVBCTHtvMV9tcjNhX2VuMF9oazNfaTBofQ==

And we know that's base64 encode! But after we decode the encoded text the result is

UPBL{o1_mr3a_en0_hk3_i0h}

And then because there is a hint in the question "Sir vignere came to ...". Decode the msg with vigenere cipher and the key is KNIGHT

KCTF{h1_th3n_wh0_ar3_y0u}