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Method for Secure And Efficient Metering on Internet (Web) Communications
The designed scheme enables secure, efficient, and accurate measurement of the number of clients that were served by a (web) server. The methods are secure and efficient, and provide a short proof for the metered data. The method does not require the use of tamper resistant modules at the client nor at the server. Each client that approaches a server sends a short message that depends on a secret piece of information known to that client. The server is able to efficiently consolidate messages received from many different clients and generate a short proof for the number of clients that visited. The length of the proof is much shorter than the number of clients the server had served (one might think of each client as sending the server a one cent coin and then the server somehow converting 10000 such coins into a single $100 note). The security features of the scheme are: (i) Servers are prevented from inflating the count of their reported clients (even if a coalition of servers cooperates and tries to forge proofs). (ii) Servers are protected from subversive clients that send erroneous metering messages. (iii) The privacy of the client is protected: the proofs that servers produce are for the number of clients that visited them and do not disclose the identities of these clients

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