Episode 512 – Break through the university firewall Internet Redirection, Hide data in photos with Steganography and answers to your Virtualization questions!
Want to bypass those nasty restrictions imposed by your corporate or university firewalls? Darren has just the trick with Internet Redirection. Ever wanted to hide secret data inside a photo? Shannon’s show us a neat steganography app. Plus Matt answers your virtualization questions!
Show Notes
Internet Redirection
Corporate and university firewalls can be a particular PITA — especially if you’re a gamer. And while SSH tunneling (even over DNS)or VPN technologies are often preferred, it is quite possible to “bounce” your traffic off an Internet Redirection server. Like a fancy proxy, rinetd allows you to specify incoming and outgoing IP and port. It features basic client access rules based on IP and even supports logging. In my segment I demonstrate accepting traffic on port 80 and transmitting it to an IRC server on port 6667.
Granted this isn’t going to fool your more complex firewalls that actually inspect packets — but if you’re just looking to get traffic through an open port I highly recommend giving rinetd a try.
Steghide
Download a copy of Steghide. Extract the zip.
You want to hide a file. First thing you need is a file to hide it in. Choose a file – whether that be a music file, jpeg, word document… whatever – and save it inside the steghide folder, which was extracted from the zip folder. Also, save your file that you want to hide inside that same folder as well.
Open up your command prompt and open the steghide folder directory. Open the steghide.exe file. The last few rows of type will tell you how to embed and extract your hidden file.
Embedding:
Type into the command prompt: ’steghide embed -cf file.jpg (this is your regular file) -ef hiddenfile.txt’ (this is the file you want to hide).
Choose a Passphrase and you’re done! You’ll notice the original photo or music file has changed it’s byte size now that you’ve embedded something inside it.
Extracting:
Type into the command prompt: ’steghide extract -sf file.jpg’ and enter the passphrase. Now, you’ll see the extracted hidden file appear inside the same folder.
Your done! Simple, eh?
May 08 2009 04:38 pm | Podcasts and e-life and technology