### Reply 180 of 321, by mattw

Alex-aut wrote on 2020-11-28, 11:11:mattw 😀 your commends are a pleasure but you did'nt lift your secrete in terms of trying the N nth bit, on which pattern do you recognize, that N (in your case '10' as the next bit is the correct bit. what is the trick, that you know, that THIS x is the correct bit ? That would also be wortrh of an explanation 😀

here human-verification based on how descrambled SC-55 Waverom looks like comes into play - the structure looks similar. So, in my most extreme manual step example N=9, I know how first 0x1ff bytes of SC-55 Waverom looks like, if those of descrambled SC-88 look similar, then the sequence is correct. Then the same for N=10, the block becomes first 0x3ff bytes. I attach 2 pictures maybe that will make it more clear.

That is what makes it harder and harder for N > 10, because the block to manually check becomes larger and larger, but on the other hand the data stream becomes more and more defined as well, that helps to rule out what are the possible options. As I said for N=11 and N=12, I found 2 potential good options, but it's extremely hard to rule out, because verification becomes very difficult.