Original subtitles

OK.

So now that we have Tor Browser installed let us go ahead and make sure that it's working as expected

and is routing all of the traffic through the Tor network.

Now I'm going to be using detailed browser on Windows but as seen before the interface is identical

on Windows Linux and OS X the installation is different.

And I showed you how to install it on all of these operating systems.

So once it's installed using the browser is exactly the same.

So I'm going to double click the launcher

and as you can see you get a normal browser window and don't maximize this window ever.

And I'll talk about that later but for now just to check to make sure that Tor is working.

I'm gonna go to check that Tor Project dot org

and as you can see it's saying congratulations.

This browser is configured to use tour and it's given us the IP that our browser appears to be coming

from.

So this is not my real IP.

This is the IP that I will appear that I'm coming from.

So this is all perfect and I'll talk about more tor settings in a future lecture.

But right now I want to show you how to bypass tor being blocked.

So in case you came to this Web site and it didn't load or if you so a warning here say in tour is not

working then this could be because your network administrator or your Internet service provider is blocking

you from using Tor.

See when you tried to access tor as I mentioned before the first thing you'll have to do is connect

to the TOR network and send your traffic to a random TOR node so you're going to pick one of these nodes

and you're going to send your traffic through it as the first node.

The problem is before you can actually connect and send data to this node your data can easily be intercepted

by your network administrator or your Internet service provider before it even reaches the first node.

And before it's even able to connect to the TOR network.

So what your Internet service provider or ISP can do is they could identify all the available tor nodes

right here the white circles because they are publicly available.

And then just block them all prevents you from connecting to any of these wide circles.

So therefore whenever you try to connect to Tor your person by Internet service provider which is running

a firewall checking if you're trying to connect to any of these nodes and if you are to block your connection

the result of this is when you come in to load this page it will either not load or it's going to tell

you that you're not using the Tor network a simple solution to this is to use at Tower Bridge as the

first node what we mean by Todd Bridges.

They are normal nodes similar to all the white circles that we can see in here.

But they are not publicly available.

So the only way that the Internet service provider was able to block us is because they know all the

white circles they know all the public nodes and they have a rule in their firewall to prevent any user

from connecting to any of these white circles.

So to bypass this we can't just use a node that is not publicly available.

It's not being advertised that way when we try to connect to it the Internet service provider will not

have this node in its list and therefore we can connect to it and then continue using Tor going out

to another Web site or even going in and accessing an online service.

So this is pretty good it's a pretty good solution until firewalls and service providers became smarter

and implemented more advanced methods what they started doing is they started using deep packet filtering

or what's known as the API to identify towards traffic and block it so they don't even care about which

node you're trying to connect to.

They started analyzing all traffic that you sent out of your computer and they managed to identify what

Tor traffic looks like.

So like I said before when you use Tor they can't really see which websites you're trying to go to but

they'll be able to see that you're trying to use the Tor network either by identifying the note that

you're trying to connect to or by using deep packet filtering which will tell them that the traffic

of this user match is a signature of Tor traffic.

Therefore this user is using tour.

Therefore we will block this traffic so the solution to this is to use applicable transport plug all

transport will try to make your traffic look similar to any other normal traffic.

So when you're trying to connect to a bridge we're going to use a bridge that can use applicable transport

and this way all the traffic that we're going to send will not look like Tor traffic.

It will look similar to traffic that's generated when you're trying to access Google or Facebook or

any other Web site similar to any normal web traffic.

Now this is a pretty good solution.

It will work in many cases but it can still fail in some instances.

But the worst case scenario even if it fails the Internet service provider will be able to know that

you're using tour but again they won't really know which websites you're trying to access unless they're

on a more sophisticated attack.

Now keep in mind this will slow down your connection.

So if you were able to browse this page and still knew that everything is working then maybe you don't.

You shouldn't really use them.

It really depends on your case and in the next lecture I'm going to show you how to configure Tor to

use a bridge with a local transport to access the Tor network even if it's being blocked.