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Secure data deletion enables data owners to fully control the erasure oftheir data stored on local or cloud data centers and is essential forpreventing data leakage, especially for cloud storage. However, traditionaldata deletion based on unlinking, overwriting, and cryptographic key managementeither ineffectiveness in cloud storage or rely on unpractical assumption. Inthis paper, we present SevDel, a secure and verifiable data deletion scheme,which leverages the zero-knowledge proof to achieve the verification of theencryption of the outsourced data without retrieving the ciphertexts, while thedeletion of the encryption keys are guaranteed based on Intel SGX. SevDelimplements secure interfaces to perform data encryption and decryption forsecure cloud storage. It also utilizes smart contract to enforce the operationsof the cloud service provider to follow service level agreements with dataowners and the penalty over the service provider, who discloses the cloud dataon its servers. Evaluation on real-world workload demonstrates that SevDelachieves efficient data deletion verification and maintain high bandwidthsavings.

Accelerating Secure and Verifiable Data Deletion in Cloud Storage via SGX and Blockchain