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Level III Challenges (57)

Page 1 of the challenges in Level III, ordered by date posted (the most recent appear first).

ORYX Stream Cipher — Part 4b

[stamp-16] - 1 user already solved this challenge.
 
 
 

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!
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Published on: 2014-04-14 20:38
Maximum number of attempts for this challenge: 15

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S Combes (jerva) 14283 (77932) 2015-03-10 22:57:57
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