Re: The Death of the Cypherpunks
Why is cypherpunks dying? Because, all crypto is economics, and the economics of crypto isn't as favorable as we thought. As the saying goes, those who live by the sword shall die by the sword. Declan McCullagh wrote: > * Instead of digital cash taking over the world, we're all using credit > cards. Cybercash has, I'm told, not just moved to credit cards, but it's > even purchased a cash register -- yep, the meatspace kind -- company. This may be somewhat of a historical accident. If only Netscape wasn't so quick to come out with SSL, or David Chaum forgot to patent blinding, or his company had a better business model, or ... But as Tim pointed out, for online shopping digital cash doesn't really buy you very much privacy since UPS needs your address anyway. For the more interesting uses of digital cash you need an untraceable network, which brings us to ZKS. > * Instead of Zero Knowlege, the company that wanted to be as cypherpunkly > as possible, doing the right thing, it still has not released source code, > it has acquired exclusive rights to key patents and said it will not > license them freely, and it has not implemented (last I checked) basic > features like link padding in its technology. The real killer is this: strong untraceability is expensive. If you want to achieve strong secrecy you can just spend one millisecond of your CPU time to encrypt a message that can't be decrypted in a million years. But if you want to achieve strong untraceability you have to increase your bandwidth usage a hundred fold and make changes to network protocols that make them more prone to failures both accidental and intentional. If ZKS decides there is not enough of a market for strong untraceability at a price they can offer, can we really blame them? If we have to blame someone we should blame economics and ultimately physics and mathematics.
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Subject: kasumi notes An Amateur's Notes on the Weaknesses of the Kasumi Encryption Algorithm Kasumi[1] is a 64-bit block cipher with a 128 bit key. Clearly with a key of such length one must analyze the algorithm to break it; naif brute force fails. So here are some early observations to interest those more capable than I. Perhaps the cipher won't be the easiest path in the phuture phones, but the privacy/MAC protocols or the key management will be the open window. Kasumi is an 8 round Feistel cipher. Kasumi has a very simple key schedule, and is fully pipeline-able, much like DES. It uses gratitous xors with hardwired constants in its key schedule, which probably indicate amateur design rather than subversion, at least in this frill. It uses only 2 S-tables, 7 bits in, 7 out; or 9 in, 9 out. The S tables are readily implemented in logic or a LUT. In logic, the 7 -> 7 S-table has a maximum comlexity of 13 xor terms, each with no more than 3 logical-ands. The 9 -> 9 table has a complexity of 12 xor terms each with no more than 2 ands. There may of course be faster boolean reductions. Kasumi uses a "FI" function which alternately truncates data and pads with zeroes. This is inside an *asymmetric* mini-Feistel structure, with 9 and 7 bits partitioning a 16 bit word. Asymmetric Feistels are weaker than symmetric ones (see Schneier et al on McGuffin IIRC). Have fun! [1] Specs of the 3GPP Confid. & Integr Algs, Doc 2: KASUMI Spec Version 1.0 23 Dec 99 copy on jya.com
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