Is this secured?

From: Ayende Rahien (Ayende_at_nospam.com)
Date: 04/30/04 

Date: Fri, 30 Apr 2004 01:30:37 +0200

Question, I need to trasfer data securely from one computer to another,
I came up with the following solution:
1> Client connect to server, recieve a public key (created for this
spesific connection only). - RSA 4096 bit
2> Using the public key, the client create a 256 bit key & 128 bit IV,
encrypt them, and send them to server.
3> All following data trasfer is done using the above key & IV using -
RjindaelManaged

How secured is this?
(I think that SSL is using this methord, or something similar, am I
correct?)
I've heard that RjindaelManaged does not work on all .Net platform -
only on XP, is this true? I need a minimun of XP, 2000, and probably 98
& ME as well for this to work.

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