Isn't that the way asymmetric encryption works anyway, internally? That's because public-key ciphers are very slow, so they're only used to encrypt the random symmetric key, and then the symmetric cipher is used for the data itself.Just use a different symetric key on every encryption (someway autogenerate it), and encrypt that key with your public key so that in the end you can get the symetric key with your private key when you want it.
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from: Jonathan "Chromatix" Morton
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website: http://www.chromatix.uklinux.net/
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