Encryption for group

From: Daniel Wehr (dwehr_at_gmx.de)
Date: 11/05/03 

Date: 5 Nov 2003 03:04:10 -0800

Hi,

in my application I want to distribute a resource (e.g. a file). The
resource (RES) should be encrypted with one public key (PUB) and I
want to be able to generate a arbitrary number of distinct private
keys (PRIV_1,PRIV_2, ...), so that the encrypted resource can be
decrypted with each of the private keys.
The following must hold:
RES = PRIV_1( PUB(RES) ) = PRIV_2( PUB(RES) ) = ...
It should also be impossible given one private key to determine
another private key.

Could anyone give me a hint or link on how to generate such a public
key and the corresponding private keys?

Any help, advice or link will be very helpfull.
Thank you!

Daniel

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