OK... the example with 2MB is very bad, the real system is more complex that
i have said, if you want, out of this new with private mails i present you
the system and you will see that there arent security problems and this is a
very good solution...

"Nelson Bolyard" <[EMAIL PROTECTED]> escribi� en el mensaje
news:[EMAIL PROTECTED]
> ere wrote:
> > Hi,
> > Ok, I will explain it better.
> > I want to create a PKCS7 in 3 steps, Why?, Because i have web clients in
> > Internet and i prefer send them 20 bytes before that a document with
2MB...
>
> There are some security problems with that approach.  In effect, you're
> asking the client to sign a hash on something the client has not seen.

Yes, ok, you are right, this thing is very very important, In the reality,
the user either see the doc in a frame when he go to sign or he can download
or see it when he wants...

> So, you could substitute the hash for a document in which the client
> promises to give you all his money and assets, and the client would
> sign it.  Not a good idea.

Yes, but you can do this with the sign in 1 step too, this problem is in the
sign tool no in the kind of sign  ;).
If you supply tools to the user to download the sign, the document and
verify all when he wants, this problems goes away...

Thank you very much Nelson for your help i think i cant encrypt in the
applet... i will sign the attributes...


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