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Length preserving compression: marrying encryption with compression
Ist Teil von
Proceedings of the 14th ACM International Conference on Systems and Storage, 2021, p.1-12
Ort / Verlag
New York, NY, USA: ACM
Erscheinungsjahr
2021
Quelle
ACM Digital Library Complete
Beschreibungen/Notizen
This work tackles an inherent conflict between two important trends. The first is the integration of data compression capabilities into many storage systems supporting random I/O on the compressed data. The second is encrypting data at the host, before data is written to the storage, in order to address regulatory and enterprise requirements. This provides end-to-end protection for the data, but since the data arrives encrypted, it prevents the storage from compressing the data. Can compression savings be achieved together with host side encryption without changing the storage protocols or storage backend? In this paper we show that they can.
We present Length Preserving Compression (LPC), which combines compression with encryption, to provide the benefits of both. The challenge is to achieve compression savings without overloading the host side with complex data management tasks which come with the fact that compression changes the data layout. We do this by keeping the data layout management capabilities on the storage while compressing and encrypting on the host. Equally important is that LPC works without changes to the compressing storage system or to the standard storage protocols involved. We implemented LPC in Linux dm-crypt and in the Xen blktap encryption and extensively evaluated its performance and impact on security and compression ratios.
Sprache
Englisch
Identifikatoren
ISBN: 145038398X, 9781450383981
DOI: 10.1145/3456727.3463780
Titel-ID: cdi_acm_books_10_1145_3456727_3463780
Format
–
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