title: algorithm for multiple digital signatures?
body: <p>suppose I have a packet of data and that I am sending the data to 10 users. I want to add an attribute to this data, something like a digital signature. Each of the 10 users would have a different "key". When they apply their key to this special signature on the data packet it returns either true or false. However they cannot determine, using their key, whether or not the other users are true or false.</p>