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

TL;DR

This paper introduces ATDD, a scheme that ensures time-sensitive data in cloud storage is automatically and securely deleted after a specified expiration, using a novel encryption method with verification capabilities.

Contribution

The paper proposes a novel ATDD scheme embedding time trapdoors in CP-ABE for fine-grained, verifiable, and automatic data deletion in cloud storage scenarios.

Findings

Provides secure, automatic data self-destruction after expiration

Ensures fine-grained access control with verifiable deletion

Demonstrates security and practicality through analysis

Abstract

With the rapid development of general cloud services, more and more individuals or collectives use cloud platforms to store data. Assured data deletion deserves investigation in cloud storage. In time-sensitive data storage scenarios, it is necessary for cloud platforms to automatically destroy data after the data owner-specified expiration time. Therefore, assured timesensitive data deletion should be sought. In this paper, a finegrained assured time-sensitive data deletion (ATDD) scheme in cloud storage is proposed by embedding the time trapdoor in Ciphertext-Policy Attribute-Based Encryption (CP-ABE). Timesensitive data is self-destructed after the data owner-specified expiration time so that the authorized users cannot get access to the related data. In addition, a credential is returned to the data owner for data deletion verification. This proposed scheme provides solutions for fine-grained access control and verifiable data self-destruction. Detailed security and performance analysis demonstrate the security and the practicability of the proposed scheme.