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Mobile ad hoc networks , commonly referred to as ad hoc networks do not need to set up network facilities because of its unique , rapid deployment , strong invulnerability , occupies an extremely important position in the field of mobile communications , in both the military and civilian spheres have very broad application prospects . However, due to some inherent characteristics of such a network , compared with traditional networks, will be subject to more security threats , mobile ad hoc network security has been more and more attention as mobile ad hoc networks , key management and authentication the central issue of security has also become the focus of the study and difficult . Firstly detailed analysis of Liu et al proposed mobile ad hoc network key distribution mechanism , proposed a new key distribution scheme for which the existence of security flaws , and security of the new scheme , the communication and computation cost for analysis. The new program will be verifiable threshold secret sharing combined with the RSA public key encryption system , not only to ensure the safety of the system key node sub key share , and also be able to test whether there has been a certified member of the node is false and transmit data to the attacker tampering thus , security, and compared to the original program can be improved. Secondly, Wang's threshold signature scheme , the security analysis , pointed out that it does not possess the unforgeability proposed mobile ad hoc network based on elliptic curve door threshold signature authentication program , at the same time to analyze the performance of the program . Compared with other authentication scheme without trusted center of the program , the system private key from start to finish any of the nodes are not visible, the higher the efficiency . Finally, based on the combined public key of a mobile ad hoc network key management scheme , analyze their strengths and weaknesses , and proposed a new secret sharing key management scheme based on the combination of a public key and a threshold on this basis , and analysis of the performance of the new program . And compared to the existing research results , the new scheme not only can better adapt to ad hoc networks lack of trusted center network resource constraints characteristics, the node fully distributed key generation and management , network security key demand , and can effectively save network storage , communication and computation cost , improve network performance .
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