A mechanism is proposed for sharing true opinions amongst a plurality of users in a cloud storage system. An opinion sharing service may generate a group public key and a plurality of member private keys. Responsive to receiving from a first member a request to open a discussion forum for the group, the opinion sharing service may send an invitation message to members of the group to join the discussion forum and, for those who joined, send the group public key to each member who joined the discussion forum. Once receiving a message encrypted using the group public key from a second member, the opinion sharing service may decrypt the encrypted message using a private key that corresponds to the second member. Next, the opinion sharing service may anonymously present the message content.
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Lin, Chien Liang, "MECHANISM FOR TRUE OPINION SHARING", Technical Disclosure Commons, (November 30, 2018)