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ORYX Stream Cipher Part II Level 2

by Mark Stamp, published on 2010-10-14

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.