Date Added: Jun 2011
Currently proposed solutions to secure code dissemination in Wireless Sensor Networks (WSNs) involve the use of expensive public-key digital signatures. In this paper, the authors present Scatter, a secure code dissemination protocol that enables sensor nodes to authenticate the program image efficiently. To achieve this, they use a scheme that offers source authentication in the group setting like a public-key signature scheme, but with signature and verification times much closer to those of a MAC. In this way, Scatter avoids the use of Elliptic Key Cryptography and manages to surpass all previous attempts for secure code dissemination in terms of energy consumption, memory and time efficiency.