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OK, now let's talk something about the encryption devices, although a number of the devices we have



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discussed earlier can perform encryption services that are dedicated, appliances that can perform encryption



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as well.



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The advantage of using these devices is that they normally provide more choice of encryption methods



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and stronger encryption options.



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They also offload the process from other devices like routers and services, which has a good thing



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because encryption and decryption process is a very tedious, intensive process and it involves other



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functions that routers and servers might not be performing.



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Sometimes these devices are called as encryption gateways, as you can see on the screen.



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This is an encryption appliance that can either sit in the line with the local social encrypting and



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decrypting all the traffic or they can function as an appliance or application.



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So encrypting any file that is sent to them within the network.



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Now you can see the examples of the encryption devices on your screen.



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While an encryption appliance is dedicated to encryption content filtering, appliance scans, the content



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of what goes through it and filters out specific content or content types.



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Now, dedicating a device to this process offloads the work on the servers or routers that could do



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this, but at a cost of greatly slowing the devices.



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Also, there is usually more functionality and granular control available with a dedicated appliance,



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and that is why we employ encryption devices.



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Internet e-mail is a good example of what you might run through one of these devices to filter out spam



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and objectionable content before the e-mail is delivered.



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Another example of the use of content filter might be to block basic websites based on the content of



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the Web pages rather than on the basis of the usual or IP address.



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An example of a dedicated content URL filtering application from a security point of view is shown on



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the screen.



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That is the DNA 120 rear-View.



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In the next lecture we will talk about analog modem.



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So I hope this lecture was pretty clear.



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The basic function of the encryption devices is to encrypt and prevent the data from malicious use or



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to just filter out packets.



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That's it.



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Now in the next lecture will talk something about the analog modem.