Pragyan_CTF 2016 writeup

Pragyan_CTF 2016 Writeup.md

every_body_is_winner

• It's bonus prob. Flag is in txt file
• Flag is igotapoint

Look at these colours

• If you open png file there are gray-black lines. It's very strange.
• If you check that lines rbg value and translate it to ascii you can get the flag is [115, 84, 101, 103, 97, 110, 48, 103, 114, 97, 112, 104, 121]
• Flag is sTegan0graphy

Harry-poter

• If you open png you can just see letter harry-porter. If you check how many colors used, it's more than two.
• We can guess 2 methods to solve it.
• First similar with Look at these colours problem, generate sentence from used color.
• Second change Non black or white colors to black.
• Last open file with hex editor.
• Answer is open image with hex editor. At the end of file there are flags.
• Flag is wherE ShOUld onE ReaLly lOoK fOr tHis flag(I'm not sure it's right)

BAIL cipher

• In hint it saids BAIL cipher is made up with Base encoding and Rail cipher.
• If we first decode Base64 then decode Rail cipher we can get flag
• Flag is xwxlQW02mu4FOjvb9hF5

I Agree

• In hint it saids this is used upgrade version of caesar cipher. If you googling this you can know that cipher is vigenere cipher
• Flag is theforceisstrongwiththisone

B_THE_B05S

• First you need to input 8 parameters.
• Parameter should be 'B'.
• I used B B B B BBBBBBBBBBB B B B as parameter
• Flag is xfaddBaseqcX

johny

• If you try to open zip file, it saids type password.
• Crack zip file password with john the ripper(JtR tool)

crack this

• If you open problem file with hex editor you can see 1F8B08 which is magic number for gz file
• Add gz extension to file and unzip it.
• I couldn't find any more hint so googling it I found my file was wierd. Actually if you unzip then problem.pcap and Clue.txt file will be generated.
• In pcap file you can know rukgzuzfiuypreymqcja is send.
• Now we have to decrypt it and It used Portra encryption. Key is localhost so if you decrypt it then you can get key
• Flag is maytheforcebewithyou