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Edu/EASY/. Received May 2004; revised September 2004; accepted September 2004 ACM Transactions on Information and System Security, Vol. 8, No. 1, February 2005. Establishing Pairwise Keys in Distributed Sensor Networks DONGGANG LIU, PENG NING, and RONGFANG LI North Carolina State University Pairwise key establishment is a fundamental security service in sensor networks; it enables sensor nodes to communicate securely with each other using cryptographic techniques. However, due to the resource constraints on sensor nodes, it is not feasible to use traditional key management techniques such as public key cryptography and key distribution center (KDC).
G. Barrantes et al. functions is stored in registers instead of the stack, and for a large number of nested calls StackGhost protects the overflowed return addresses through write protection or encryption. Milenkovi´c et al.  propose an alternative architecture where linear blocks of instructions are signed on the last basic block (equivalent to a line of cache). The signatures are calculated at compilation time and loaded with the process into a protected architectural structure. Static libraries are compiled into a single executable with a program, and dynamic libraries have their own signature file loaded when the library is loaded.
Section 7 discusses the related work. Section 8 concludes this paper and points out some future research directions. 2. POLYNOMIAL-BASED KEY PREDISTRIBUTION FOR SENSOR NETWORKS In this section, we briefly review the basic polynomial-based key predistribution protocol in [Blundo et al. 1993], which is the basis of our new techniques. The protocol in [Blundo et al. 1993] was developed for group key predistribution. Since our goal is to establish pairwise keys, for simplicity, we only discuss the special case of pairwise key establishment in the context of sensor networks.