Transformation

this challenge asks us to download something from the link given in the challenge description

desc of Transformation challange

firstly, you can see there is an enc link in the description? You can download it by using the wget command

$ wget https://mercury.picoctf.net/static/1d8a5a2779c4dc24999f0358d7a1a786/enc

after that, you see the enc file has been downloaded in the directory. then you can just see the contents of the file using the cat command

$ cat enc                           
灩捯䍔䙻ㄶ形楴獟楮獴㌴摟潦弸彥㜰㍢㐸㙽

and i found a random character that cannot be interpreted as a flag. this time, i will use a tool from the website to help interpret the character using CyberChef

after opening the website, select the magic operation and drag the box to the recipe section

after drag it, you just need to input the random character into the input section. don't forget to click the box for intensive mode, it will make it easier for you to search for random characters in detail

then, you can see the output result of the text that i input before. then i just scroll through the output until i find the picoCTF format flag

results output

and that's it, you can copy the flag and don't forget to submit it on the picoCTF platform. happy and enjoy!