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Content-Centric Networking (CCN) is an internetworking paradigm that offersan alternative to today's IP-based Internet Architecture. Instead of focusingon hosts and their locations, CCN emphasizes addressable named content. Bydecoupling content from its location, CCN allows opportunistic in-networkcontent caching, thus enabling better network utilization, at least forscalable content distribution. However, in order to be considered seriously,CCN must support basic security services, including content authenticity,integrity, confidentiality, authorization and access control. Currentapproaches rely on content producers to perform authorization and accesscontrol. This general approach has several disadvantages. First, consumerprivacy vis-a-vis producers is not preserved. Second, identity management andaccess control impose high computational overhead on producers. Also,unnecessary repeated authentication and access control decisions must be madefor each content request.  These issues motivate our design of KRB-CCN - a complete authorization andaccess control system for private CCNs. Inspired by Kerberos in IP-basednetworks, KRB-CCN involves distinct authentication and authorizationauthorities. By doing so, KRB-CCN obviates the need for producers to makeconsumer authentication and access control decisions. KRB-CCN preservesconsumer privacy since producers are unaware of consumer identities. Producersare also not required to keep any hard state and only need to perform twosymmetric key operations to guarantee that sensitive content is confidentiallydelivered only to authenticated and authorized consumers. Most importantly,unlike prior designs, KRB-CCN leaves the network (i.e., CCN routers) out of anyauthorization, access control or confidentiality issues. We describe KRB-CCNdesign and implementation, analyze its security, and report on its performance.

KRB-CCN: Lightweight Authentication & Access Control for Private Content-Centric Networks