Abstract: Based on IBE and DifficHcllman key agreement arithmetic, an efficient authenticated key agreement protocol for MANET was proposed. The PKG distribution and the created public/private key of nodes without using the trust third part were achieved by used distributed polynomial secret sharing scheme. The authenticated key agreement was carried out by IBS and DH key agreement arithmetic. The protocol was combined with IBE and DH, it had the advantage of low storage and traffic of IBE,as well as the communication after key agreement could adopt symmetry cryptographic algorithm which could availability lower computation and save resource of the MANET. The protocol was proved secure in theory.

Key words: Cryptography,Key agreement,IBE,Diffie-Hellman key agreement,Secret sharing