Data remanence is the residual representation of data that remains even after attempts have been made to remove or erase the data. This residue may result from data being left intact by a nominal file deletion operation, by reformatting of storage media that does not remove data previously written to the media, or through physical properties of the storage medium that allow previously written data to be recovered. Data remanence may make inadvertent disclosure of sensitive information possible should the storage media be released into an uncontrolled environment (e.g., thrown in the trash, or obtained by a third party).
Various techniques have been developed to counter data remanence. These techniques are classified as clearing, purging/sanitizing or destruction. Specific methods include overwriting, degaussing, encryption, and physical destruction.
Effective application of countermeasures can be complicated by several factors, including media that are inaccessible, media that cannot effectively be erased, advanced storage systems that maintain histories of data throughout the data's life cycle, and persistence of data in memory that is typically considered volatile.
Several standards exist for the secure removal of data and the elimination of data remanence.
Other articles related to "data remanence, data, remanence":
... Security Establishment Clearing and Declassifying Electronic Data Storage Devices, July 2006 New Zealand GCSB NZISM 2010, New Zealand Information Security Manual, Dec 2010 NZSIS ... February 1998 Air Force AFSSI 8580, Remanence Security, 17 November 2008 (formerly AFSSI 5020) Navy NAVSO P5239-26, Remanence Security, September 1993 ...
... See also Data remanence and Data erasure Computer (electronic or digital) documents are more difficult to sanitize ... cases, when information in an information system is modified or erased, some or all of the data remains in storage ... The general term for this problem is data remanence ...
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