The Research Of Fault-Tolerant Aggregate Signature And Aggregate Signcryption

With the rapid development and large-scale application of Internet of things(IOT)technology,the security of IOT applications has become the focus of attention.Due to the large number of terminal devices in the IOT environment,it is difficult to use the conventional encryption and digital signature technology to provide the confidentiality and authentication of data in consideration of the efficiency.Therefore,the research on efficient encryption and digital signature technology has become one of the core tasks in the field of IOT security.Among them,the aggregate signature/signcryption is an important way to solve this problem,but aggregate signature/signcryption schemes have a disadvantage,that is,as long as there is an invalid signature/signcryption,all aggregated signatures/signcryptions will be denied by the verifier.In order to solve this problem,the fault-tolerant aggregate signature/signcryption scheme is proposed.But in the existing research results,the fault-tolerant algorithm still has some shortcomings,that is,poor flexibility,difficult to implement,fault-tolerant defects,and low efficiency.Therefore,in view of the existing problems,this thesis carries out research work.Based on the typical application scenario(vehicular sensor network)of IOT,this thesis first studies the design of efficient aggregate signature algorithm.The signature adopts certificateless mechanism,and the aggregation of signatures is realized.On this basis,the existing fault-tolerant algorithm is improved,and a combination of "partition method" and "virtual rounding method" is proposed to construct the fault-tolerant aggregate signature,which makes the proposed scheme easier to implement,without fault-tolerant defects,and suitable for any number of signatures for fault-tolerant aggregation,thus improving the flexibility of the scheme.Secondly,an efficient and certificateless fault-tolerant aggregate signcryption scheme is designed by extending the fault-tolerant aggregate signature scheme constructed in this thesis.Furthermore,the applicable principles and basis of designing the fault-tolerant mechanism are given to optimize computing cost and communication cost.By combining the criteria for designing fault-tolerant function with the "virtual rounding method",the efficiency of the fault-tolerant algorithm is further improved.Finally,the security of the two schemes is analyzed,and it is proved that the two schemes satisfy unforgeability under the random oracle model,and the fault-tolerant aggregate signcryption scheme also satisfies indistinguishability.In order to verify the effectiveness of the research results,the experimental simulation and comparative analysis of the two proposed schemes are carried out.The results show that the proposed fault-tolerant aggregate signature scheme has good flexibility while providing fault-tolerant ability compared with similar schemes.The proposed fault-tolerant aggregate signcryption scheme not only has the characteristics of high flexibility,but also improves the fault-tolerant efficiency due to the use of optimized fault-tolerant criteria.