Multiple recipients encryption

[Noiano]

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Hello everybody
I was wondering about how gnupg works when I encrypt a message for
multiple recipients. As long as I know public-key encryption works as
described in this image
http://upload.wikimedia.org/wikipedia/commons/f/f9/Public_key_encryption.svg.
But how about using multiple public keys? I really cannot figure it out.

Thanks for your time

Noiano
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