Abstract: A distributed key Management scheme for Mobile Ad-hoc Networks(MANETS) was proposed,which combines Combined Public Key(CPK) cryptography with secret sharing threshold cryptography. Four aspects were depicted detailedly including initializing system, designing management platform, obtaining nodes' private/public key and updating private matrix sharing. Analysis shows that this project is secure, distensible, concise and applicable. So it is especially suitable for the characteristics of MANETS.

Key words: Combined public key, Threshold scheme, ECC composed principle, Sccd matrix