Considering the low computing efficiency of current multiparty Private Set Intersection (PSI) protocol and the leakage of user private information when it is applied in the cloud environment, a cloud outsourcing multiparty PSI protocol based on Bloom Filter (BF) and homomorphic encryption was proposed. Firstly, the NTRU Cryptosystems-based proxy re-encryption algorithm was used in the protocol to convert ciphertexts encrypted with different public keys into ciphertexts encrypted with the same public keys, and a large amount of complicated computing was outsourced to a cloud server. Secondly, Bloom filter, characterized by its low computing complexity, high space utilization rate and great query efficiency, was used to improve the efficiency of information encrypting, decrypting and querying when the protocol was operated. The user only needs a small amount of computing during the operation of the protocol instead of taking interactions and staying online in real time. Theoretical analysis and experimental results show that the proposed protocol has linear computation and communication complexity, it can work out intersection results without leaking user private information, which meets the requirement of practical application.

For dealing with the problem of low efficiency and high maintenance cost when multi-point breakdown or change occurs in Wavelength Division Multiplexing (WDM) network with high speed and large capacity, the component of Reconfigurable Optical Add/Drop Multiplexer (ROADM) was used to construct a flexible network. Firstly, the 5-node network configuration model was provided. Then, the relation between loss and transmission length was investigated when optical network was composed of ROADM under dynamic conditions. The design flow of network transmission length was proposed. Next, a 5-node bi-directional fiber ring experiment network was constructed, and the optical loss characteristics were measured. Finally, based on the analysis of experiment data, it shows that the computed optical loss value and the measured loss value are approximately equal (0.8 dB difference). Thus, the feasibility of the design is verified, which assures the reliable transmission between nodes.