secure client-side platform

[<liudieyu () umbrella name>]

how to have a secure client-side platform for secret communication?
    ... transferring and storing secret messages, online banking, etc

i got some fresh ideas in mind, and would like to share it here:
0. watch network with sniffer, so be sure no byte is sent to weird destinations
1. read-only operating system(knoppix, etc), so every boot is a fresh start
2. get every secret processed in memory and stored as encrypted in remote server

any suggesion or fresh idea on this topic is welcome

this document for ordinary people on the street:
http://umbrella.name/upid/trooseid

bugtraq guys can directly go to the conclusion part:
http://umbrella.name/computer/trooseid/trooseid_online/#conclusion

have a nice day,

Liu Die Yu