Cryptology ePrint Archive: Report 2015/052

Interactive Message-Locked Encryption and Secure Deduplication

Mihir Bellare and Sriram Keelveedhi

Abstract: This paper considers the problem of secure storage of outsourced data in a way that permits deduplication. We are for the first time able to provide privacy for messages that are both correlated and dependent on the public system parameters. The new ingredient that makes this possible is interaction. We extend the message-locked encryption (MLE) primitive of prior work to interactive message-locked encryption (iMLE) where upload and download are protocols. Our scheme, providing security for messages that are not only correlated but allowed to depend on the public system parameters, is in the standard model. We explain that interaction is not an extra assumption in practice because full, existing deduplication systems are already interactive.

Category / Keywords: cryptographic protocols / deduplication, cloud storage, message-locked encryption

Original Publication (with major differences): IACR-PKC-2015

Date: received 21 Jan 2015

Contact author: Sriram Keelveedhi, skeelvee at eng ucsd edu

Available format(s): PDF | BibTeX Citation

Version: 20150122:171249 (All versions of this report)

Short URL: ia.cr/2015/052

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