Level 11

Url: http://ctf.infosecinstitute.com/leveleleven.php
Description: What another sound again? No it must not be a sound? But wait whaT?
Bounty: $110

Solution:
The image just the same as image in levelten, lets check the other images (found in the source code), the php images, lets open with Hex Workshop

level11

infosec_flagis_aHR0cDovL3d3dy5yb2xsZXJza2kuY28udWsvaW1hZ2VzYi9wb3dlcnNsaWRlX2xvZ29fbGFyZ2UuZ2lm

I don’t know what is the last string after flagis_ maybe a base64, lets try add “=” in the end of the strings and decode it, the result is

http://www.rollerski.co.uk/imagesb/powerslide_logo_large.gif

open the link then add to the flag. For linux command you can use like this

level11flag

 The flag is: infosec_flagis_powerslide

Reference and Tools:
1. Base64 – http://en.wikipedia.org/wiki/Base64
2. Hex Workshop – http://www.hexworkshop.com/
3. Linux command line

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