Quote:
Originally Posted by kevinp
I don't think it will be any different. When people post the link to their file, they will also post the encryption key.
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Not all cryptosystems are symmetric and therefore do not involve the exchange of secret keys.
Consider an PKI version where the uploader encrypts to the public key[s] of members of a known and trusted group. Works with regular communications as well as anything else (not just, or even primarily, about piracy).