Abstract: Combined identity-based system with the idea of litcCA(Certificate Authority)，a scheme of identity-based and lightweight C八based cryptography for wireless sensor network was proposed. The scheme not only avoids the drawback of private key escrow in the identity-based system, but also gains the advantage of simplifying complication of producing and verifying public key in traditional certificate-based CA system. Analysis shows that the scheme equips with characteristics of file-producing public key, file-verifying public key, certificate less, and high security which can defense some attacks easily carrying into wireless environment. It is applicable to be used in wireless network to gain data confidentiality, integrity, and non-refutation.

Key words: Wireless network security, Wireless sensor network(WSN)，Identity-based, Lite-CA