[EMAIL PROTECTED] wrote:

> Now I'd like to know how difficult it would be to get the symmetric
> key without actually having the public key?
> 
> Should I generate or modify the RSA key in some specific way to
> make this more difficult?

It's not clear to me what the application is here.  If you're planning
to keep a public key private (secret) that's a clear indication
that this is not an application for public key cryptography.

With RSA you can envelope a key such that only the recipient
can open it, and you can sign it or encrypt with your private
key so that the recipient knows it's from you.

It's possible that you might want to use passphrase based
encryption (PKCS#5), or store the key in a PKCS#12 object.

Start with the CryptoFAQ at RSA Labs...

http://www.rsasecurity.com/rsalabs/faq/index.html

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