I had a little trouble with the English, but I think I followed the math. I believe Victor's KGB friend is claiming that DES is a group. Victor, does the following text contradict your claim? Sorry for my poor English. I want to saw, that DES is`t group. We can`t say,
that: A k1, k2: E k0, that des(k2, des(k1, text))=des(k0, text) (A mean "for all", E mean "exist"); or: E k1, k2: A k0, that des(k2, des(k1, text))!=des(k0, text) I saw, that: E f(k, text): A k1, k2: E k0, len(k0)=len(k1)=len(k2), that des(k2, des(k1, test))=f(k0, text) f() like des(), but f() is not des()!!! My friend saw, that introder must try only 2^56 keys for des(des()). Once more, sorry for my poor English. PS I am sorry for my stupid letter about PGP randomizer. --- Victor A. Borisov aka blaster; Relcom R&D; Email: blaster@rd.relcom.msk.su; Phone: +7(095)-943-4735; +7(095)-198-9510; === Don`t panic! ===