DefCon CtF Quals 2014 writeup – hackertool
hey, we need to check that your connection works, torrent this file and md5 it
The torrent file when loaded into Vuze showed that the file name was every_ip_address.txt. So I downloaded some of the file and observed the format. The format of the file was “0.0.0.1\n0.0.0.2\n…. “.
So I wrote a quick python script to calculate the md5:
#!/bin/python import hashlib m = hashlib.md5() fsize = 0 a = '' for i in xrange(256): for j in xrange(256): for k in xrange(256): for l in xrange(256): a = str(i)+'.'+str(j)+'.'+str(k)+'.'+str(l)+'\n' fsize += len(a) m.update( a ) print m.hexdigest()
The flag was “1a97f624cc74e4944350c04f5ae1fe8d”.