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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

Storage and Security of Digital Information

Rouda’s CSCI 101 Sections

http://www.flickr.com/photos/selvin/2762032143/

permanent storage media
"Permanent" Storage Media
  • Computer Hard Drive
  • Optical Disks
    • CD
    • DVD
    • BlueRay
  • Magnetic Tape
    • Tape Drive
  • Solid State
    • Flash Drives
    • SSD Hard Drives
relative storage capacities
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
how data is stored on disks
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

harmful software

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
harmful software1

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
virus protection

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.
computer crime

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.
computer crime1

Legal Issues

Computer Crime
  • Most corporate computer crime is done by employees
      • 58% unauthorized employees
      • 24% authorized employees
      • 13% outside hacker
      • 5% other
image files
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
image files1
Image Files

http://photo.net/equipment/digital/basics/

image files2
Image Files

http://photo.net/equipment/digital/basics/

exam next week
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