Abstract: Crowdsourced testing is the application of crowdsourcing in software testing.It performs testing in a distributed and collaborative way,which has received widespread attention.However,the open crowdsourced testing environment and centralized storage mode put the intellectual property at risk of leakage and being manipulated.In order to realize the privacy protection and trusted storage of crowdsourced testing intellectual property,this paper proposes corresponding protection methods for different intellectual property.For the test tasks and the tested codes,AES and the improved CP-ABE algorithm are used for fine-grained data access control.By outsourcing complex encryption operations to the trusted third party,the proposed algorithm reduces the computing cost of requester.Meanwhile,it also supports the dynamic attribute revocation and meets the forward and backward security.In addition,using blockchain and InterPlanetary File System (IPFS),a distributed trusted storage and consistency right confirmation method of large-scale intellectual property data is realized.It protects intellectual property data from tampering and helps to solve intellectual property disputes.Finally,the performance test and comparative evaluation verify that the encryption and decryption efficiency of this method is improved compared with previous methods,and the blockchain has a high perfor-mance.Security analysis shows that the scheme meets the security requirements.

Key words: Access control, Blockchain, CP-ABE, Crowdsourced testing, Intellectual property, Trusted storage