  Content-Centric Networking (CCN) is a new class of network architectures
designed to address some key limitations of the current IP-based Internet. One
of its main features is in-network content caching, which allows requests for
content to be served by routers. Despite improved bandwidth utilization and
lower latency for popular content retrieval, in-network content caching offers
producers no means of collecting information about content that is requested
and later served from network caches. Such information is often needed for
accounting purposes. In this paper, we design some secure accounting schemes
that vary in the degree of consumer, router, and producer involvement. Next, we
identify and analyze performance and security tradeoffs, and show that specific
per-consumer accounting is impossible in the presence of router caches and
without application-specific support. We then recommend accounting strategies
that entail a few simple requirements for CCN architectures. Finally, our
experimental results show that forms of native and secure CCN accounting are
both more viable and practical than application-specific approaches with little
modification to the existing architecture and protocol.
