Shredders range in size and price from small and inexpensive units meant for a few pages, to large units used by commercial shredding services that costs hundreds of thousands of pounds and can shred tonnes of documents an hour. Some shredders used by a commercial shredding service are built into a shredding truck.
The normal small shredder is an electrically powered device, but there are unpowered ones such as special scissors with multiple blade pair and shredders which are hand-cranked.
These machines are classified according to the size and shape of the shreds they produce.Shredders can range in size from standard scissors and other hand-operated devices all the way up to truck-sized shredders. There are also shredder selector sites that can help consumers choose a shredder that is appropriate for their needs.
Strip-cut shredders, the least secure, use rotating knives to cut narrow strips as long as the original sheet of paper. Such strips can be reassembled by a determined and patient investigator or adversary, as the product (the destroyed information) of this type of shredder is the least randomized. It also creates the highest volume of waste inasmuch as the chad has the largest surface area and is not compressed.
Cross-cut shredders use two contra-rotating drums to cut rectangular, parallelogram, or diamond-shaped shreds.
Particle-cut shredders create tiny square or circular pieces.
Disintegrators and granulators repeatedly cut the paper at random until the particles are small enough to pass through a mesh.
Hammermills pound the paper through a screen.
Pierce and Tear Rotating blades pierce the paper and then tear it apart.
Grinders A rotating shaft with cutting blades grinds the paper until it is small enough to fall through a screen.
There are numerous standards for the security levels of paper shredders, including:
DIN 32757
Level 1 = 12 mm strips
Level 2 = 6 mm strips
Level 3 = 2 mm strips (Confidential)
Level 4 = 2 x 15 mm particles (Commercially Sensitive)
Level 5 = 0.8 x 12 mm particles (Top Secret or Classified)
Level 6 = 0.8 x 4 mm particles (Top Secret or Classified) (unofficial extension of the DIN 32757-1 standard)
The normal small shredder is an electrically powered device, but there are unpowered ones such as special scissors with multiple blade pair and shredders which are hand-cranked.
These machines are classified according to the size and shape of the shreds they produce.Shredders can range in size from standard scissors and other hand-operated devices all the way up to truck-sized shredders. There are also shredder selector sites that can help consumers choose a shredder that is appropriate for their needs.
Strip-cut shredders, the least secure, use rotating knives to cut narrow strips as long as the original sheet of paper. Such strips can be reassembled by a determined and patient investigator or adversary, as the product (the destroyed information) of this type of shredder is the least randomized. It also creates the highest volume of waste inasmuch as the chad has the largest surface area and is not compressed.
Cross-cut shredders use two contra-rotating drums to cut rectangular, parallelogram, or diamond-shaped shreds.
Particle-cut shredders create tiny square or circular pieces.
Disintegrators and granulators repeatedly cut the paper at random until the particles are small enough to pass through a mesh.
Hammermills pound the paper through a screen.
Pierce and Tear Rotating blades pierce the paper and then tear it apart.
Grinders A rotating shaft with cutting blades grinds the paper until it is small enough to fall through a screen.
There are numerous standards for the security levels of paper shredders, including:
DIN 32757
Level 1 = 12 mm strips
Level 2 = 6 mm strips
Level 3 = 2 mm strips (Confidential)
Level 4 = 2 x 15 mm particles (Commercially Sensitive)
Level 5 = 0.8 x 12 mm particles (Top Secret or Classified)
Level 6 = 0.8 x 4 mm particles (Top Secret or Classified) (unofficial extension of the DIN 32757-1 standard)
Information provided by www.securityconsole.co.uk
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