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This paper proposes an efficient broadcast encryption scheme for key
distribution in MANET. No message exchange is required to establish a group
key. The communication overhead remains unchanged as group size grows. In
order for the group member to obtain session key, only one bilinear pairing
computation is required. The proposal is also evaluated through efficiency,
security analysis and comparison with other existing schemes. We test the
efficiency of the scheme on a modern station through simulation. The
performance analysis shows its suitability for large scale MANETs. It is
shown that the new scheme is provable secure in standard model. The
comparison indicates that this scheme has efficiency surpassing congeneric
schemes. Furthermore, an improved scheme against chosen ciphertext attack
(CCA) is proposed in order to enhance the security. Thus, the proposal in
this paper can not only meet security demands but is also efficient in
terms of computation and communication.
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