security - What technologies would you recommend for secure client GUI application? -

i've got big project ahead of me, it's going online, kind of hazard game, poker. problem is, i'm not sure best way approach client side.

because game involve real money, security going big issue. server side, don't think make lot of difference choose, since communication encrypted, i'm more worried client.

from experience working java, there quite few decompilers, , bytecode isn't hard crack (am wrong here).

since game require 2d graphics, i'd work technology makes gui development @ least little bit smooth.

my other thought flash, since haven't seen many online casinos use flash, might little bit more vulnerable java/.net?

what i'm trying ask here is, technology recommend develop secure, client side gui application fancy 2d graphics?

in opinion, there no such thing secure client. no matter do, decompile/reverse engineer it-- when there real money involved. if you, i'd concentrate on making server secure. assume every client hacked , , can cheat.

so given clients can , hacked, have no opinion on client software. choose whatever want. maybe use obfuscator slow them down-- can make pain when debugging client issues.

i have opinion installation. it's much, easier if there nothing install, i.e. game runs entirely on web site.