Efficient metering scheme in the WWW

In this paper, we present a secure and efficient metering scheme to measure the interaction between clients and servers in Web advertising. In most cases, Web advertising is composed of advertisers, clients, servers and an audit agency that collects metering information about the number of clients that are served by each server. The metering scheme should always be secure against fraud attempts by servers that maliciously try to inflate the number of their clients and against clients that attempt to disrupt the metering process, so we suggest secure and efficient metering schemes based on some cryptographic techniques.