Anyone heard of DSN? I think thats the right order of the initials... ... its supposedly the only crypto-hardware solution for protecting an entire network on the Internet. You put one of these $5,000 units at one end of a lan, and another one somewhere else on the Internet, and the company gaurantees secure, encrypted transmissions. The TCP/IP headers and data are mangled, encrypted, etc. It uses 512bit keys and I was just wondering how the authentication is done. Does anyone have any specs on these units? Supposedly it does not require a 3rd party entity to verify that the two units are both valid, when determining the initial public/key pairs. Perhaps there is hardcoded data in the units that is used to verify this? The company supposedly has some proprierty method ... how can we be sure this expensive unit can do its job if information on the encryption has not been released. Is there any freeware software solution that has been put through more of a torture test, and proven to work? It seems to be the best approach would be to put such a program on a server that is acting as the gateway/firewall on each network. (define(RSA m e n)(list->string(u(r(s(string->list m))e n))))(define(u a)(if(> a 0)(cons(integer->char(modulo a 256))(u(quotient a 256)))'()))(define(s a)(if (null? a)0(+(char->integer(car a))(* 256(s(cdr a))))))(define(r a x n)(cond((= 0 x)1)((even? x)(modulo(expt(r a(/ x 2)n)2)n))(#t(modulo(* a(r a(1- x)n))n)))) "SGI and Linux both run Motif and X11. They both compile c++ cleanly (using gnu g++). They're the same!"