Abstract: A hybrid key predistribution scheme for heterogeneous wireless sensor networks is proposed. It deploys different methods to establish keys for heterogeneous nodes. Advanced nodes authenticate each other and reach key agreement using identitybased cryptography and common nodes establish pairwise key using random key predistribution method based on oneway hash chain. The pairwise key is established by key agreement and shared key discovery which takes advantage of public key and random key predistribution method. The analysis and simulation show that the proposed scheme performs well in terms of security connectivity and antiattack by the combination of characteristic of heterogeneous nodes and hybrid key management.

Key words: key predistribution, hybrid cryptography, hash chain, HWSN