I have a Linksys FW v8, and I want to use wireless password "12345" for WEP.

I cant set it up, I just can specify a 64 or 128 bit, I want 40 bit, 5 char long.

Is it possible?

  • 2
    Cant you just add a few characters to the password and make it 12345678? There isn't really much difference.
    – Mythrillic
    Jan 29, 2012 at 1:36
  • What is the exact model number of your "FW"? Jan 29, 2012 at 12:54
  • linksys wrt54g with FW (firmware) v8.0
    – Nicolas S
    Jan 29, 2012 at 23:00

1 Answer 1


Choose 64-bit.

Wikipedia says

A 64-bit WEP key is usually entered as a string of 10 hexadecimal (base 16) characters (0-9 and A-F). Each character represents four bits, 10 digits of four bits each gives 40 bits; adding the 24-bit IV produces the complete 64-bit WEP key. Most devices also allow the user to enter the key as five ASCII characters, each of which is turned into eight bits using the character's byte value in ASCII;



If your router software doesn't have features that you want, you can always check if the hardware is supported by DD-WRT and whether that supports the features you need. Since the source is available, you can add features you want (or pay a developer to add them for you)

Updating firmware usually has the potential to render your device unusable. People updating firmware have to be prepared for that outcome.


Of course, we all know WEP is insecure and a 5-character key is insecure. You know that, I just want to remind anyone else reading this that WPA2 is the way to go unless you are just playing at breaking into your own router or something.

  • Written in bold wont apply for my WRT54g linksys.. Any way i can go with the direct password instead of using a passphrase to be hexed to my pass?
    – Nicolas S
    Jan 29, 2012 at 23:00
  • @NicolasS: See updated answer. Jan 29, 2012 at 23:13
  • @NicolasS: If you type in a passphrase of "12345" and click "generate", what Hex values do you get for Keys 1-4? Jan 29, 2012 at 23:22
  • some 10 digit hex passes.. Im just doing this to imitate another access point, so some old people can have the same essid and pass in their home and office, no one is going to crack the pass there is even a faster open network... i just want WEP pasword "12345", this is becoming harder than i thought. I wont install ddwrt, unless there is no way i can go with 5 char ascii pass..
    – Nicolas S
    Jan 30, 2012 at 3:26
  • @NicolasS: The reason I asked for the Hex values is so that we can work out the relationship between the passphrase and the exact hex values. That way you may be able to work out what passphrase is needed to produce the hex equivalent of 12345. (31 32 33 34 35) Jan 30, 2012 at 11:03

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