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Challenge "ORYX Stream Cipher Part II"  

  By: admin on July 21, 2010, 1:07 p.m.

The ORYX stream cipher consists of three 32-bit LFSRs X, A, B which are shifted differently depending on some bits in the LFSR X. The key stream is a combination of the highest 8 bits of each of the three LFSRs. It is neither feasible nor necessary to search the whole 96-bit key space, there are more efficient methods!Hint: Enter the codeword in hex with non-capital letters and a leading zero.
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 Last edited by: admin on Oct. 31, 2021, 2:54 a.m., edited 1 time in total.

Re: Challenge "ORYX Stream Cipher Part II"  

  By: Veselovský on Aug. 23, 2011, 6:59 p.m.

This is a computer killer compared to part one of this challenge.
These survivors grow like weeds.
Can anyone give a hint?

Re: Challenge "ORYX Stream Cipher Part II"  

  By: fretty on Aug. 26, 2011, 4:06 p.m.

Yes, I think I need a hint too.

How come the attack used in part 1 fails here?


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