Skipjack and RC5
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Where can find these (Skipjack and RC5) ciphers latest materials such as international paper, book or reference. I saw some of them but they published around 10 years ago. That is too old to use. Is this any new materials for them? Help to find it? Thank you
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Where can find these (Skipjack and RC5) ciphers latest materials such as international paper, book or reference. I saw some of them but they published around 10 years ago. That is too old to use. Is this any new materials for them? Help to find it? Thank you
I've implemented Skipjack recently on a small micro as well as in VB. I don't have the code handy, and since it belongs to my client I really couldn't share it, but a Google search for Skipjack encryption will turn up some good stuff within a page or two (if you don't mention encryption, you'll get information about boats and other stuff). I haven't seen anything to suggest that Skipjack has been "broken", though cryptosystems that are very close to Skipjack have been. I would not recommend tampering with the internal workings of Skipjack, since such tampering is apt to make it significantly weaker. If interoperability with existing Skipjack implementations is not required, however, increasing the number of rounds to 48 (from 32) might not be a bad idea. Note that if the number of rounds is reduced at all, cryptanalytic attacks become easier than brute force. By my understanding, increasing the number of rounds to 48 would improve security (an attack on a 31-round version of Skipjack has been discovered; using only 32 rounds would seem to be cutting things rather 'close').