CyberHack Crypto Challenges Write-up

Website Link :- ctf.cyberhack.co.in

CHALLENGE : BASE

In This challenge by name we can get an idea that it is something related to the bases and there is also given an cipher text which is easy as it is a alphanumeric string we can try for base64. I decode it using CyberChef and get the flag.

CHALLENGE : ORDER

Similarly as above challenge we can get solution from the name of the challenge. Since, challenge name is ORDER so it is related to rotation I tried for the Caeser Cipher brute-force from Decode.fr and get the flag.

 

CHALLENGE : AS YOU C IT!

This challenge is related to number base encoding and which can be easily found from the cipher. As it have no alphabets so it is not a hex and have number greater than 9 so it is not octal So we can go for decimal decoding after decoding we get our flag.

CHALLENGE : LetsNacho

In this challenge we are given this cipher text : - 

123123123123123 123123123123 123123123 123123123123 123123123123
123123123123123 123123123 123 123 123123123123123 123 123 123123123123
123123 123123123 123123123 123 123123123123123 123 123123123123 123123
123123123 123123123 123123123123 123123123123123 123123 123123123123
123123123123 123123123 123123123123 123123123123 123123123123 123 123
123123123 123123123123123

And in challenge it have a keyword TAP so this is the hint to the challenge. But how it can be Tapcode so we can see there is a same pattern of  "123" so I replace all the 123 with the . ( dot ) and that I try to decode it from Cryptii and get our flag easily.

CHALLENGE : HmmOkay

In this challenge we are given this cipher text : - 

....................!?.?...?.......?...............?....................?.?.?.?.!!?!.?.?.?!!!!!!!..?..................................
........!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.......!...........................!.?...........!..?!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!.....!.................!.................................!.?...!..?!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!.................................................!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..................
...................!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.......................!.......................!.!!!!!...!.!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.....!...........................!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..............................
...!.!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.................................!.!!!!!!!!!!!!!!!!!!!.!.!!!!!!!!!!!!!!!................
.......!...........!.!!!!!!!!!.!!!!!!!!!!!!!.?.?.......!.!.!..?.?................................................!.

After seeing this cipher I get confused and google some of the part of the cipher string but there is no result. So I come back and read the challenge name and description carefully here we can see that one keyword is regularly used in both OKAY and we can see that it is some type of esoteric language so I googled OKAY ESOTERIC DECODER and I find that it was a Ook esoteric language and deocde it from Decode.fr.

CHALLENGE : UNZIPMEH

In this we are given a zip file and it have our flag.txt inside it. But zip is password protected and we have given hint related to password of zip as password  is in the format of year,month,date so we have to make a word list to brute-force for the zip password. So for it I write a simple python script and crack the zip using JohnTheRipper.

Python Script :- https://drive.google.com/file/d/1xopmC88pftH8dfek4QGFc5ObYvVkQlCS/view?usp=sharing

More Challenges WriteUps Coming Soon 😃 ..................................