Just thinking about the huge amount of sensitive data that is bouncing all over the Internet, 24 by
seven makes me want to scream the word security, it is seriously clear that we need it almost as much
as air.
Right.
I hope you understand words.
Most of that data is sent out over the Internet without any encryption or any security measures, but
at least not really the sensitive stuff which should be sent via one of the several different security
protocols available today.
Now, these vital protocols are really sets of conditions or rules that define how a secure connection
is maintained.
And when we send sensitive data through an unsecured medium like the Internet or a wireless connection
before talking about the security protocols that data network exams or any other placement interviews
you can ask on, I'd like to define a few terms.
The first one is tunnelling.
Now, tunnelling is basically a means of encapsulating one protocol with another protocol to ensure
that the transmission is secure.
Now, let's give an example.
Uh, the lion's share of us use IP protocol, right?
That is the Internet protocol known as the payload protocol, which can be encapsulated within a delivery,
like the delivery protocol, like the IP sick.
If you take a look at these individual packets, you would see that they're encrypted.
If you look at the process as a whole, it appears that a point to point channel is created over the
Internet.
Now, make a note to yourself that usually standard protocol works at the higher level than the layer
of than the layer in which the payload protocol is working.
So basically a tunnel is like this.
So if you can see here this image, so I'll take my pen.
This tunnel is basically the IP protocol and these are the data packets that are going through the Internet
protocol.
It's like a protective measure so that hackers are the interceptors cannot have your data and generally
this is together is encrypted and then sent or or you can just and encrypt this package and sent through
the IP protocol.
This is the basic idea of tunneling.
You just have to imagine a tunnel and the car's going through it are the individual packets.
And if someone tries to attack the tunnels or someone tries to harm that car, the tunnel is there to
protect those cars.
That is the basic idea of tunneling.
In the next lecture, we'll see about the virtual private network.
I'm pretty sure that most of you use weapons.
But in the next lecture, let us have a clear idea of why do we need to use weapons and what are exactly
weapons?