Bill Stewart wrote:
S-box structure is one of the critical issues in designing Feistel-type networks; if you understand the mathematics very very well, you can do it yourself, and if you don't, then you don't understand it well enough to be sure the S-boxes are secure enough, and thus you shouldn't be selling it to customers.
Thanks, I shall look up Feistel-type networks. Nope, I don't understand the mathematics very very well, and that's why I asked. While I haven't seen the official GOST specs but all the reference I could find indicates that GOST specs don't discuss the process of generating SBOX permutations and GOST sboxes are not mathematically understood. Regarding the developer's ethical responsibilities with experimental technology I rather have the consumer decide (and of course document the limitations). Thanks, Vipul -- Powell lingered. "How's Earth?" It was a conventional enough question and Muller gave the conventional answer, "Still spinning." -- "Reason", Asimov. ================================================================== Vipul Ved Prakash | - Electronic Security & Crypto vipul@best.com | - Web Objects 91 11 2233328 | - PERL Development 198 Madhuban IP Extension | - Linux & Open Systems Delhi, INDIA 110 092 | - Networked Virtual Spaces