Original subtitles

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The first encryptions they are going to talk about breaking it is going to be WEP encryption because

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it's the oldest one.

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It's the easiest one to break.

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But we still need to learn how to break it because you will see networks that still use with encryption

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encryption uses an algorithm called R-S.C. for each packet is encrypted at the access point and then

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it's sent to the air.

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Once the client receives it since the client has the key it will be able to decrypt the packet and read

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the information inside it.

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So very simple Acholi the IP encrypted packet sent that client to receive it.

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The client has the key so the client decrypt it.

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Same way when the client says the packet it's encrypted encrypted and then send it in the air the access

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point to receive it.

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The access point has the key so it'll decrypt the packets.

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So each packet sent into the air has a unique keystream which ensures that the keystream is unique by

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using 24 bit initialization vector.

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So the initialization vector is a random number it's sent into each packet and it's sent into plaintext.

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So this part is not encrypted.

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If you read the packet you'll be able to read it in plain text.

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The problem with the IP or the initialization vector it's very short the 24 bits is not that long.

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So in a busy network there would be a very large number of packets sent into the air.

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This means the number of possibilities of random IPs will be exhausted and we will have to Pakistan

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have the same initialization vector.

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So the initialization vector is a 24 bit random keep it sent into the air in each packet and it's sent

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into plaintext as the plaintext in a busy network.

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We're going to have a very large number of packets.

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This means that the possibilities of unique IPs will be exhausted and that we will who are sniffing

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these all these packets who will be able to collect two packets that have the same initialization vector.

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Once we have two packets they have the same initialization vector aircraft energy can be used to use

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statistical attacks to determine the keystream.

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And after that it will be able to determine the work.

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OK.

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So from the above we know the more Ivey's or initialization vectors that we collect the more likely

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that will successfully crack the whip.

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So our main goal now when we try to crack WEP is to collect as much as we can because once we have a

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lot a large number of IPs and we're going to have two packets they use the same IP then aircraft ngi

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is more likely to be able to determine the keystream.

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And they were key for the target network and the next video will do that.

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We'll see how that actually works.

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And it should be easier to understand.