Trustworthy service composition in service-oriented mobile social networks suffers from the opaque characteristics of service components

the subjective interpretation of trust requirements

and the opportunistic connectivity of social participants.To tackle these issues

we propose a trust-based decentralized service-composition approach.The proposed approach decentralizedly evaluates the trustworthiness of target services at both component and composite levels based on a lattice-based trust model to prevent data from being transmitted to untrustworthy counterparts.Moreover

by analyzing the dependency relationships

service are selected satisfied both global and local constraints specified by service consumers and vendors respectively.Finally

based on Monte Carlo method

a trustworthy social path selection

optimization and fault-tolerant approach is developed to deliver service evaluation and invocation information.Experimental results demonstrate its practical suitability of service composition for service-oriented mobile social networks

which leads to low cost for service evaluation

as well as high success rate and aggregated trust value for path selection.