IPOD2: an irrecoverable and verifiable deletion scheme for outsourced data.

The article focuses on IPOD2, a novel scheme for irrecoverable and verifiable deletion of outsourced data in cloud storage environments. IPOD2 employs an overwriting-based deletion method combined with an extension of the Integrity Measurement Architecture (IMA) to measure and record detailed operations during the deletion process, with measurement results protected by Trusted Platform Module (TPM) hardware. This approach addresses limitations of existing key management-based and overwriting-based schemes by providing both strong irrecoverability of deleted data and trustworthy, detailed deletion proofs that users can verify via remote attestation. Implemented as a Linux kernel prototype, IPOD2 demonstrates minimal performance overhead and outperforms comparable schemes in deletion and verification efficiency while preserving user privacy and resisting adversaries seeking to recover deleted data or dispute deletion proofs.