01621nas a2200193   4500008004100000245009000041210006900131260000900200300001400209490000600223520095500229653001901184653001901203653003301222653002901255100001201284700001401296856011701310       2011                        eng d00aThe design and challenges of online reprogramming system for wireless sensor networks0 adesign and challenges of online reprogramming system for wireles  c2011  a255 - 2600 v93 aAt present, the online network reprogramming faces two challenges: 1) How to save the energy consumed during the code dissemination; and 2) How to enhance the security of online network reprogramming. In this paper, we modify the work flow of online reprogramming system and separates an alone reprogramming component from the whole program image which need not be transmitted in order to reduce the energy consumption. According to the security vulnerabilities in the image management aspects of code dissemination, acipher puzzle-based image management algorithm is proposed. According to the based-request attacks, several counter measures are introduced in our online reprogramming system, such as secure broadcast authentication based on cluster keys and the request count technique. By integrating several key techniques, our online reprogramming system can securely and energy-efficiently disseminate the new program image into the whole WSNs.10aAuthentication10aHash Key Chain10aOnline Network Reprogramming10aWireless sensor networks1 aXie, M.1 aZhang, G.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84855387891&partnerID=40&md5=a4ce74298f75f1a849cd6ed7c203d24f