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I have a sagem router. this router is able to generate 4 WEP keys from a given passphrase.

Example:

Passphrase: "hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha"

key1: b583bc6804d5c1d7fc2ae46972

key2: d0494a8087e8d742e9e93cf2f5

key3: f0c5af9a3ab7e54337767db1a9

key4: 7e95d22229dacb8f09c9bbd1d7

I m wondering how it can generate 4 keys.

I can use md5sum to generate 1 key like this:

$ echo -n "hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha" | md5sum

b583bc6804d5c1d7fc2ae46972 842868

Are there a way to generate the 4 keys and not only one key with linux command?

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First, a WEP key isn't generated using MD5 hashing, it uses RC4. Second, the reason you can generate multiple is because a WEP key is usually an IV (initialization vector (usually the current time or a random number) and your key: (IV + Key) -> RC4 = WEP key – h3rrmiller May 8 at 17:53
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also this is a dupe (stackoverflow.com/questions/16446910/…) – h3rrmiller May 8 at 17:55
Cross post here: askubuntu.com/questions/292656/…, here: stackoverflow.com/questions/16446910/…, and here. – Sukminder May 8 at 18:27
@h3rrmiller. you can generate a WEP key from passphrase using MD5 hashing please see page 23 of this document – MOHAMED May 9 at 16:41
@h3rrmiller RC4 is used in the WEP encryption and not in the WEP key generation – MOHAMED May 9 at 16:42
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1 Answer

up vote 1 down vote

One quick way to do it (if you dont care to take an IV + key and send it through RC4) is:

i=1
while [ $i -le 4 ]
do
    dd if=/dev/random bs=1 count=16 2>/dev/null | xxd -ps
    i=$(( i+1 ))
done

This will generate four 128-bit wep keys. Adjust count for different strengths

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are there a standard way to generate the 4 WEP keys – MOHAMED May 9 at 10:25
the standard way is (IV + key) -> RC4 = WEP key – h3rrmiller May 9 at 13:55
could you point me to the standard. looking for link to the standard document – MOHAMED May 9 at 16:17
the answer is wrong. the IV and the RC4 are used in the encryption. An IV is added to the WEP key in the encryption for more security. – MOHAMED May 9 at 16:31
@MOHAMED This answer is not wrong. That is how WEP works... Your question is very hard to follow as it is not very clear what you are looking for. A WEP key is nothing more than a hexadecimal string of variable length. – h3rrmiller May 9 at 16:35
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