On the basis of KDC (key distribution center)and diversity of DNA molecules

an innovative DNA model for key predistribution and key predistribution scheme based on the new DNA model are proposed.And in addition

by combing with the good characteristics of key pool

a novel DNA model based pairwise key establishment algorithm is presented for distributed sensor networks

which uses characteristics of the code of oligonucleotides in DNA strands for key predistribution

and in which

any pair of nodes exchange DNA strands information and use the code of some oligonucleotide in the DNA strand as their actual pairwise key.Theoretical and experimental analyses show that

compared with those previous well-known polynomial-based and polynomial pool-based key predistribution models and pairwise key establishment algorithms

the newly proposed algorithm has better security

lower communication costs and higher probability of direct pairwise key establishment.So

it is a better and more efficient new pairwise key establishment algorithm suitable for distributed sensor networks.