Tags: ctfx2016
Rating:
<span>I realise that:
1. They split the big string into 2 small</span>er strings (add a character '\x01' if the length is odd)
<span>2. They reversed these 2 strings.
3. They split 2 strings into 2*2 = 4 smaler string </span><span>(add a character '\x01' if the length is odd)
4. They reversed these 4 strings.
.....Repeat until all strings have only 1 character....
They join them together and delete 'x01' </span><span>characters.
So I input a string have the same length as "the output" so I will which position the 'x01' </span><span>characters were and put them into "the .
output".
Finally, I input that string into the code and have the flags.
My code in Python: https://github.com/phamhuudanh96/CTF_WriteUp/blob/master/ctfx_2016_lambda.py
P/s: this is the first time I add writeup. :D If there is sth wrong, pls email me: [email protected]
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