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Storage and Security of Digital Information

Storage and Security of Digital Information. Rouda’s CSCI 101 Sections. http://www.flickr.com/photos/selvin/2762032143/. "Permanent" Storage Media. Computer Hard Drive Optical Disks CD DVD BlueRay Magnetic Tape Tape Drive Solid State Flash Drives SSD Hard Drives.

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Storage and Security of Digital Information

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  1. Storage and Security of Digital Information Rouda’s CSCI 101 Sections http://www.flickr.com/photos/selvin/2762032143/

  2. "Permanent" Storage Media • Computer Hard Drive • Optical Disks • CD • DVD • BlueRay • Magnetic Tape • Tape Drive • Solid State • Flash Drives • SSD Hard Drives

  3. Relative Storage Capacities • CD ROM ≈ 650 MB • DVD ≈ 4.7 GB (single layered) • BlueRay ≈ 25 GB (single layered) • Flash ≈ 256 GB+, continues increasing • Flash Drive Costs: • in 2006 $25 bought 125MB • in 2007 $25 bought 2GB • in 2008 $25 bought 8GB • in 2009 $15 bought 8GB • In 2010 $25 bought 16GB • In 2012 $35 buys a 32GB

  4. How Data is Stored on Disks • 1s and 0s • Sectors • Directory • file deletion • Disk Fragmentation • How often to defrag? • Do you defrag on a Mac? http://www.detto.com/rmf-data-recovery-how-to.html

  5. Viruses Harmful Software • Virus • usually destroys files • copies itself • ex - a MSWord macro sent via email • Worm • objective: destroy the network, not your PC • copies itself via network connections

  6. Viruses Harmful Software • Trojan Horse • arrives inside something else • replicates itself • the really bad ones wait for a particular date • Spyware • objective: steal information • personal information (bank account info, …) • passwords • e.g. monitor and transmit your keyboard input

  7. Viruses Virus Protection • Anti-Virus Software (Anti-Malware) • looks for known viruses and common virus formats • Firewalls • prohibits unauthorized external access into your PC or network. Can be hardware or software.

  8. Legal Issues Computer Crime • Making and Spreading Viruses • Stealing Corporate Data • Destroying Corporate Data • Denial of Service Attack (DoS) • you can shut down cnn.com by quickly hitting it with thousands of bogus requests • Social Engineering • Using non-technical skills to gain access to private information.

  9. Legal Issues Computer Crime • Most corporate computer crime is done by employees • 58% unauthorized employees • 24% authorized employees • 13% outside hacker • 5% other

  10. Image Files 24-bit image - uncompressed • 640 x 480 pixels = 307,200 pixels per image • 307,200 x 3 bytes-per-pixel = 921,600 bytes Average JPEG Image • 800 x 600 pixels = 85,000 bytes • compressed, so quality of details is pretty low • about 750 medium-quality jpegs will fit onto a CD

  11. Image Files http://photo.net/equipment/digital/basics/

  12. Image Files http://photo.net/equipment/digital/basics/

  13. Exam Next Week • Format: • lots of multiple choice • some short answer • Types of Questions: • lots of advantages and disadvantages • lots of definitions • lots of general concepts, trends over time, etc. • some compare and contrast • no dates

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