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Dumpster diving is the act of digging through trash, discarded equipment, or abandoned locations in order to obtain information about a target organization or individual. Typical collected items include old calendars, calling lists, handwritten meeting notes, discarded forms, product boxes, user manuals, sticky notes, printed reports, or the test sheet from a printer. Just about anything that is of any minor internal value or sensitivity is a treasure to be discovered through dumpster diving. The materials gathered via dumpster diving can be used to craft a more believable pretext.

To prevent dumpster diving, or at least reduce its value to an attacker, all documents should be shredded and/or incinerated before being discarded. Additionally, no storage media should ever be discarded in the trash; use a secure disposal technique or service. Secure storage media disposal often includes incineration, shredding, or chipping.