International Business Machines Corporation
MULTI-KEY SECURE DEDUPLICATION USING LOCKED FINGERPRINTS

Abstract:

A computer-implemented method includes computing a fingerprint of a data chunk, encrypting the fingerprint with a fingerprint key, and encrypting the data chunk with a base key and the encrypted fingerprint. The method also includes encrypting the encrypted fingerprint with a user key to generate a doubly encrypted fingerprint and sending the encrypted data chunk and the doubly encrypted fingerprint to a storage system. The storage system does not have access to the base key, the fingerprint key and the user key. A computer-implemented method includes computing a fingerprint of a data chunk and encrypting the data chunk with a base key and the fingerprint. The method also includes encrypting the fingerprint with a user key and sending the encrypted data chunk and the encrypted fingerprint to a storage system. The storage system does not have access to the base key and the user key.