We present STIP, a new model for Scalable Trusted IP networks, that are secure and resilient to cyber-attacks without impairing reliability. STIP addresses managed network use-cases including enterprise network authentication and authorization, and ISP use-cases, including trust based routing, and application aware networking. It can provide an enabling infrastructure that improves resilience to the painful BGP hijacking and distributed denial of service attacks.At the data plane, STIP consists of a trusted forwarding engine, that uses authenticated trust extensions to process traffic reliably. At the control and management plane STIP divides the network into trust domains that evaluate trustworthiness of devices in the domain, and distribute it securely using transitive trust. Our vision is Internet-wide STIP deployment . We present a migration process based on trust domains that can be used to gradually upgrade current IP networks to STIP.

A cyclically permutable code is a binary code whose codewords are cyclically distinct and have full cyclic order. An important class of these codes are the constant weight cyclically permutable codes. In a code of this class all codewords have the same weight w. These codes have many applications, in. Eluding in optical code-division multiple-access communication systems and in constructing protocol-sequence sets for the M-active-out-of-T users collision channel without feedback. In this paper we construct optimal constant weight cyclically permutable codes with length n, weight w, and a minimum Hamming distance 2w-2. Some of these codes coincide with the well-known design called a difference family. Some of the constructions use combinatorial structures with other applications in coding.>