OK, now let's talk something about the encryption devices, although a number of the devices we have
discussed earlier can perform encryption services that are dedicated, appliances that can perform encryption
as well.
The advantage of using these devices is that they normally provide more choice of encryption methods
and stronger encryption options.
They also offload the process from other devices like routers and services, which has a good thing
because encryption and decryption process is a very tedious, intensive process and it involves other
functions that routers and servers might not be performing.
Sometimes these devices are called as encryption gateways, as you can see on the screen.
This is an encryption appliance that can either sit in the line with the local social encrypting and
decrypting all the traffic or they can function as an appliance or application.
So encrypting any file that is sent to them within the network.
Now you can see the examples of the encryption devices on your screen.
While an encryption appliance is dedicated to encryption content filtering, appliance scans, the content
of what goes through it and filters out specific content or content types.
Now, dedicating a device to this process offloads the work on the servers or routers that could do
this, but at a cost of greatly slowing the devices.
Also, there is usually more functionality and granular control available with a dedicated appliance,
and that is why we employ encryption devices.
Internet e-mail is a good example of what you might run through one of these devices to filter out spam
and objectionable content before the e-mail is delivered.
Another example of the use of content filter might be to block basic websites based on the content of
the Web pages rather than on the basis of the usual or IP address.
An example of a dedicated content URL filtering application from a security point of view is shown on
the screen.
That is the DNA 120 rear-View.
In the next lecture we will talk about analog modem.
So I hope this lecture was pretty clear.
The basic function of the encryption devices is to encrypt and prevent the data from malicious use or
to just filter out packets.
That's it.
Now in the next lecture will talk something about the analog modem.