Consider an
environment in which many servers serve an even larger number of clients. It is
required to meter the interaction between each server and the clients and in
particular the number of clients that approached the server. An immediate
application is to measure the popularity of web pages in order to decide on
advertisement fees. The metering process should be efficient (even more efficient
than micropayments) to all parties involved (clients, servers and the
metering authority) and secure against fraud attempts. We present several such
metering systems and discuss other scenarios where such auditing is useful. One
application of these technique is for on-line petitions.
Postscript , gzipped Postscript.
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