[ic] Generating Keys & Applying Signatures

["ETH Zurich" <ethz@hotmail.com>]

I need to modify the Create New Account and the Check Out processes in such 
a way that:

1. Whenever a new user register him/herself, Interchange will generate a 
key-pair for him/her and store it a certain directory on the server;

2. Whenever a registered user checked out, Interchange will make use of the 
user's key-pair to sign on the purchase order before encrypting it and 
sending it to the supervisor.

Interchange already provides the functions to encrypt and send the purchase 
order via (encrypted) email to the supervisor. What I would like to do now 
is to modify the process such that it will do the 2 things that I stated 
above. The most important thing is for Interchange to SIGN the purchase 
order using the buyer's key-pair before encrypting and sending it to the 
higher level.

Can anybody please help me?
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