Abstract: An identity authentication scheme in opportunistic network was proposed based on Fuzzy-IBE,which can conform to the characteristics of self-organized management,openness and intermittent connectivity in opportunistic networks．The scheme is committed to addressing the security issues such as privacy leaks in the existing social context-based routing protocols．Because of the intermittent connectivity,the traditional cryptography cannot be applied to the opportunistic networks．So in F-ONIAS,an off-line PKG is used to generate private keys for users．Meanwhile,in identity-based cryptography,identity information may be forged．To avoid such security risks,the biological information is used as a node’s identifier．Simulation results show that implementing our security scheme does not induce any negative impact on the average delay,and achieves higher delivery probability and lower routing overhead rate.

Key words: Opportunistic networks,Fuzzy identity-based encryption,Social context-based routing