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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


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