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A5/1 And W7 Key Stream Generator

generator stream

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#1 anribalam

anribalam

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Posted 05 April 2012 - 01:18 AM

Hello,

i want to create a keystream using A5/1 an W7 stream cipher.

can i using this cipher to create a very long bit keystream?
and how long bits can i generate?

also i confused about the input of this stream cipher.
it's input fixed 64 bit key length? or i can using 128. 192 or 256 bits long keys?
(for A5.1)
(for W7 i dont know yet)

sorry for my bad english. :)
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#2 anribalam

anribalam

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Posted 08 April 2012 - 07:25 PM

hmm..
for example :

using 64 bits keys A5/1 generate 224 bits keys.
*its cause each frame in GSM are 224 bits keys length.

can i use A5/1 to generate 512 bits keys? or larger?

thanks in advance..


EDIT :

i mean, if i generate 512 bits keystream (> 224 bits). it is the next 288 bits can be used to do some encryption process?
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