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With the rapid development of general cloud services, more and moreindividuals or collectives use cloud platforms to store data. Assured datadeletion deserves investigation in cloud storage. In time-sensitive datastorage scenarios, it is necessary for cloud platforms to automatically destroydata after the data owner-specified expiration time. Therefore, assuredtimesensitive data deletion should be sought. In this paper, a finegrainedassured time-sensitive data deletion (ATDD) scheme in cloud storage is proposedby embedding the time trapdoor in Ciphertext-Policy Attribute-Based Encryption(CP-ABE). Timesensitive data is self-destructed after the data owner-specifiedexpiration time so that the authorized users cannot get access to the relateddata. In addition, a credential is returned to the data owner for data deletionverification. This proposed scheme provides solutions for fine-grained accesscontrol and verifiable data self-destruction. Detailed security and performanceanalysis demonstrate the security and the practicability of the proposedscheme.

ATDD: Fine-Grained Assured Time-Sensitive Data Deletion Scheme in Cloud Storage