Deleting index entries from compliance storage

In response to regulatory focus on secure retention of electronic records, businesses are using magnetic disks configured as write-once read-many (WORM) compliance storage devices to store business documents such as electronic mail for their mandated retention periods. A document committed to a compliance storage device cannot be altered or deleted even by a superuser until its retention period is over, and hence is secure from attacks originating from company insiders. Secure retention, however, is only a part of a document's lifecycle: it is often crucial to properly delete documents once their retention period ends. It is relatively simple to delete a document, but much harder to remove its index entries from WORM. Yet if these entries are not obliterated, the contents of the deleted document can often be reconstructed. In this paper, we formally define secure deletion of document entries from an inverted index on compliance storage. We show that previously proposed deletion s...

• Type: Conference
• Year: 2008
• Where: EDBT
• Authors: Soumyadeb Mitra, Marianne Winslett, Nikita Borisov
• Keywords: Database, EDBT 2008, Secure Deletion, Secure Retention, Storage Index Entries