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Abstract. PSIRP (Publish-Subscribe Internet Routing Paradigm) is an EU FP7 funded project that has developed a clean-slate architecture for the future Internet, based on the publish-subscribe primitives (rather than the send-receive ones), all the way down to the core networking functions. The PSIRP vision is a pure information-centric Internet architecture, possibly providing remedies to many of the current Internet problems. In PSIRP, all is information and everything is about information. Content-based identities, recursive application of ideas, cryptographic techniques, and the Trust-to-Trust principle are all extensively used to achieve the design goals. Furthermore, incentive compatibility and socio-economic considerations are guiding the design from the outset, to ground the project in reality and to provide credible and viable potential deployment paths. The project has developed, implemented, and preliminarily evaluated solutions for rendezvous, topology formation and routing, and information forwarding, with ongoing work currently focusing in experimenting. A new (also EU FP7 funded) follow-on project, PURSUIT (PublishSubscribe Internet Technologies), will refine and further explore and expand PSIRP's vision. We believe that this will eventually lead to a more complete architecture and protocol suite, thereby providing for more extensive performance evaluation and investigations on scalability. This paper provides an overview of the PSIRP concepts and the developed architecture, along with some key results, and outlines the research directions of the PURSUIT project, focusing on the project goals and its expected outcomes.

Abstract-The PSIRP (Publish-Subscribe Internet Routing Paradigm) project is an EU funded project aiming at developing and evaluating a clean slate architecture for the future Internet. PSIRP's ambition is to provide a new form of internetworking which will offer the desired functionality, flexibility and performance, but will also support availability, security, and mobility, as well as opportunities for innovative applications and new market opportunities. This paper illustrates PSIRP's high level architecture, revealing its principles, core components and basic operations through example usage scenarios. While the focus of this paper is specifically on the operations within the PSIRP architecture, the revelation of the workings through our use cases can also be considered being useful to similar work on publish-subscribe architectures.Index Terms-Future Internet, clean slate, networking usage scenarios.

Abstract. Information-centric networking (ICN) is a paradigm that aims to better reflect current Internet usage patterns by focusing on information, rather than on hosts. One of the most critical ICN functionalities is the efficient resolution/location of information objects i.e., name resolution. The vast size of the information object namespace calls for a highly scalable and efficient name resolution approach. Currently proposed solutions either rely on a DHT structure, thus ensuring load balancing and scalability at the cost of inefficient routing, or on hierarchical structures, thus preserving routing efficiency at the cost of limited scalability. In this paper, we study in detail the tradeoff between state/signaling overhead versus routing efficiency for a generic nameresolution system based on a novel DHT scheme with enhanced routing properties, and compare it to DONA, an ICN architecture based on hierarchical resolution and routing.

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Information is the building block of Information Centric Networks (ICNs). Access control policies limit information dissemination to authorized entities only. Defining access control policies in an ICN is a non-trivial task as an information item may exist in multiple copies dispersed in various network locations, including caches and content replication servers. In this paper we propose an access control enforcement delegation scheme which enables the purveyor of an information item to evaluate a request against an access control policy, without having access to the requestor credentials nor to the actual definition of the policy. Such an approach has multiple merits: it enables the interoperability of various stakeholders, it protects user identity and it can set the basis for a privacy preserving mechanism. An implementation of our scheme supports its feasibility.

While blockchains and more generally distributed ledger technologies (DLTs) are passing over their hype curve peak, their shortcomings are becoming more apparent. One relatively recent approach to address their performance, scalability, privacy, and other problems are to use multiple different DLTs instead of relying on just one. While there are no really established standards for combining several DLTs, a few repeating patterns can be observed. In this paper, we present a survey of interledger approaches, discussing and comparing their underlying mechanisms. A shared motivation for all of the discussed interledger solutions is to move away from the ''one chain rules them all'' model to one that allows the interconnection of multiple ledgers, with different features and advantages, while also supporting innovation. The interledger approaches discussed in this survey include 1) atomic cross-chain transactions, 2) transactions across a network of payment channels, 3) the W3C Interledger Protocol (ILP), 4) bridging, 5) sidechains, and 6) ledger-of-ledgers. The approaches are compared according to whether they support the transfer or the exchange of value, their interconnection trust mechanism, complexity, scalability, and transaction cost. INDEX TERMS Atomic swaps, blockchain, cross-chain transactions, distributed ledger technologies (DLTs), hash-locks, interledger protocol (ILP), sidechains, time-locks.

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