dale_para_bajo
Well Known Member
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I spent whole night studying possibilities.
SAT is a program with a promest of finding solutions. But process still to complicated for my mind.
So I did spent quite some time studying possibility of Meet at The middle for CSA. CSA rounds are 23. So the middle is not exactly half as 12.5 is in the middle of a round. So I did a modify version. Encrypt to 12 decrypt to 13. And there we can get to a middle expression common to both. So the possibility is there. But how useful it is on a Full Round description we still doing 12+13 = 23 rounds!!
Now many paper mention this reduction on rounds. But I can not really see how to process the whole Idea to arrive to a final incomplete key.
Well I can see how doing 4 rounds can utilize 32 of the 64 bits. ANd I could accept we could build a table of 48GB just with 4 round Block Cypher. But then I get stock trying to match (Meat at the middle) a Real Crypt8 that was found with Whole CSA ( including stream) to out 48GB incomplete CSA ( ONLY Blocks)Table. UFF there is something I do not understand as 32 bits are not enough to generate the stream cypher needed to decrypt. I give up for today on this.
SAT is a program with a promest of finding solutions. But process still to complicated for my mind.
So I did spent quite some time studying possibility of Meet at The middle for CSA. CSA rounds are 23. So the middle is not exactly half as 12.5 is in the middle of a round. So I did a modify version. Encrypt to 12 decrypt to 13. And there we can get to a middle expression common to both. So the possibility is there. But how useful it is on a Full Round description we still doing 12+13 = 23 rounds!!
Now many paper mention this reduction on rounds. But I can not really see how to process the whole Idea to arrive to a final incomplete key.
Well I can see how doing 4 rounds can utilize 32 of the 64 bits. ANd I could accept we could build a table of 48GB just with 4 round Block Cypher. But then I get stock trying to match (Meat at the middle) a Real Crypt8 that was found with Whole CSA ( including stream) to out 48GB incomplete CSA ( ONLY Blocks)Table. UFF there is something I do not understand as 32 bits are not enough to generate the stream cypher needed to decrypt. I give up for today on this.