Challenge Description
For this challenge, we will basically repeat the same steps we did to retrieve the flag for the substitution0 challenge. First, we download the file using wget, and then run cat to see the message.
Closely similar challenges
substitution0, substitution1 and substitution2 are 3 closely similar PicoCTF Cryptography challenges.
The Message
The encrypted message looks like this:
isnfnnpctitnznfmxhisnfwnxxntimjxctsnascdstushhxuhgqbinftnubfciruhgqnicichktckuxbackdurjnfqmifchimkabturjnfusmxxnkdnisntnuhgqnicichktehubtqfcgmfcxrhktrtingtmagckctifmichkebkamgnkimxtwscusmfnznfrbtnebxmkagmfonimjxntocxxtshwnznfwnjnxcnznisnqfhqnfqbfqhtnhemscdstushhxuhgqbinftnubfciruhgqnicichkctkhihkxrihinmuszmxbmjxntocxxtjbimxthihdnitibankitckinfntinackmkanpucinamjhbiuhgqbinftucnkunanenktcznuhgqnicichktmfnheinkxmjhfchbtmeemcftmkauhgnahwkihfbkkckdusnuoxctitmkanpnubickduhkecdtufcqitheenktnhkisnhisnfsmkactsnmzcxrehubtnahknpqxhfmichkmkacgqfhzctmichkmkaheinksmtnxngnkitheqxmrwnjnxcnznmuhgqnicichkihbusckdhkisnheenktcznnxngnkitheuhgqbinftnubfcirctisnfnehfnmjniinfznscuxnehfinusnzmkdnxctgihtibankitckmgnfcumkscdstushhxtebfisnfwnjnxcnznismimkbkanftimkackdheheenktczninuskcvbntctnttnkicmxehfghbkickdmkneenuicznanenktnmkaismiisnihhxtmkauhkecdbfmichkehubtnkuhbkinfnackanenktcznuhgqnicichktahntkhixnmatibankitihokhwisncfnkngrmtneenuicznxrmtinmusckdisngihmuicznxrisckoxconmkmiimuonfqcuhuiectmkheenktcznxrhfcnkinascdstushhxuhgqbinftnubfciruhgqnicichkismitnnotihdnknfminckinfntickuhgqbinftucnkunmghkdscdstushhxnftinmusckdisngnkhbdsmjhbiuhgqbinftnubfcirihqcvbnisncfubfchtcirghiczmickdisngihnpqxhfnhkisncfhwkmkankmjxckdisngihjniinfanenkaisncfgmusckntisnexmdctqcuhUIE{K6F4G_4K41R515_15_73A10B5_702E03EU}
Decoding the Message
Using the same tool that was used in substitution0 and substitution1, we can easily obtain the flag.
Flag
PICOCTF{N6R4M_4N41Y515_15_73D10U5_702F03FC}