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Donald	Mar 29 2006, 01:43 PM
Elite member Posts: 454 Group: Trusted Member Member #8 Joined: September 2, 2005	"Insecure" there was the Insecure Block Cipher, which is way harder than Diego Ha! No one, to my knowledge, has made any progress on my "Impractical-1" known plaintext challenge. And THAT should be easier than your block cipher. (although rot13 did lay out a plan of attack) It's amazing how secure simple ciphers can be. Not that I'd TRUST them mind you, but they ARE a pain to break. I'm completely stumped and dead ended on the Block Cipher. I've decided that cracking block ciphers is just out of my leauge for now. "Insecure" I have hopes for cracking Diego - although I think it'll involve a computer. I would guess a paper crack isn't going to happen. The vulnerability I'm trying to exploit certainly requires a computer, but it will only work against certain spots in the crypt text where interesting patterns occur. I think I can identify sequences of plain text in those cases. But then if I can reproduce the rest of the square from there is a big question. "Insecure" But of course I don't mean brute force. (Pointless, with a keyspace of 25!) Brute force against Diego wouldn't actually be 25!. Thats a problem with mixed alphabets, the keyspace is actually much smaller because they are usually created with keywords. The nice thing about Diego is that it doesn't eliminate duplicate letters from the key. I'm trying to modify my "Tornado" mixed alphabet system to USE duplicate letters in the key so you aren't throwing away entropy.


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