The first encryptions they are going to talk about breaking it is going to be WEP encryption because
it's the oldest one.
It's the easiest one to break.
But we still need to learn how to break it because you will see networks that still use with encryption
encryption uses an algorithm called R-S.C. for each packet is encrypted at the access point and then
it's sent to the air.
Once the client receives it since the client has the key it will be able to decrypt the packet and read
the information inside it.
So very simple Acholi the IP encrypted packet sent that client to receive it.
The client has the key so the client decrypt it.
Same way when the client says the packet it's encrypted encrypted and then send it in the air the access
point to receive it.
The access point has the key so it'll decrypt the packets.
So each packet sent into the air has a unique keystream which ensures that the keystream is unique by
using 24 bit initialization vector.
So the initialization vector is a random number it's sent into each packet and it's sent into plaintext.
So this part is not encrypted.
If you read the packet you'll be able to read it in plain text.
The problem with the IP or the initialization vector it's very short the 24 bits is not that long.
So in a busy network there would be a very large number of packets sent into the air.
This means the number of possibilities of random IPs will be exhausted and we will have to Pakistan
have the same initialization vector.
So the initialization vector is a 24 bit random keep it sent into the air in each packet and it's sent
into plaintext as the plaintext in a busy network.
We're going to have a very large number of packets.
This means that the possibilities of unique IPs will be exhausted and that we will who are sniffing
these all these packets who will be able to collect two packets that have the same initialization vector.
Once we have two packets they have the same initialization vector aircraft energy can be used to use
statistical attacks to determine the keystream.
And after that it will be able to determine the work.
OK.
So from the above we know the more Ivey's or initialization vectors that we collect the more likely
that will successfully crack the whip.
So our main goal now when we try to crack WEP is to collect as much as we can because once we have a
lot a large number of IPs and we're going to have two packets they use the same IP then aircraft ngi
is more likely to be able to determine the keystream.
And they were key for the target network and the next video will do that.
We'll see how that actually works.
And it should be easier to understand.