YCTF

No need for Brutus by Ary.eth

2024-09-30(1 min. read) - crypto

Description

Author: @aenygma

A simple message for you to decipher:

squiqhyiiycfbudeduutvehrhkjki

Submit the original plaintext hashed with MD5, wrapped between the usual flag format: flag{}

Ex: If the deciphered text is "hello world", the MD5 hash would be 5eb63bbbe01eeed093cb22bb8f5acdc3, and the flag would be flag{5eb63bbbe01eeed093cb22bb8f5acdc3}.


Solution

Brutus killing Caesar once again.

We open up DCode on the ceasar cipher decryption, and input our simple message.

Press decrypt and bingo, caesarissimplenoneedforbrutus

Just one little step before flagging, we encrypt it in MD5, still on DCode, giving us c945bb2173e7da5a292527bbbc825d3f.

After adding the flag format, we can flag this challenge.