关键词: 组合公钥, 秘密共享, 椭圆曲线密码, Ad Hoc

Abstract: Mobile Ad Hoc is a special network，its self-organized characteristic makes it face serious security problems.Based on Elliptic curve cryptosystem，a key management scheme for Ad Hoc is proposed.In this scheme we make use of combined public key and fully distributed secret sharing，so it doesn’t need a trusted centre and public key certificates，high extensibility，and it can resist interior and exterior attackers effectively.Analysis show that the security of this scheme is based on the difficulty of solving the elliptic curve cryptography discrete logarithm problem，and its implementation is efficient.

Key words: combined public key, secret sharing, elliptic curve cryptography, Ad Hoc