Top Ten Security Need to Know

1
Computers Talk Binary
2
http//www.roubaixinteractive.com/PlayGround/Binar
y_Conversion/Binary_to_Text.asp

• Send me a polite or write me a polite coded
  binary message
• dpruitt_at_umd.edu
• http//www.roubaixinteractive.com/PlayGround/Binar
  y_Conversion/Binary_to_Text.asp

3
Even Pictures are Binary
4
Steganography
5
http//www.wired.com/wired/archive/7.07/what.html
6
Steganography

• Means covered writing
• dates back to ancient Greece
• common practices
• etching messages in wooden tablets and covering
  them with wax
• tattooing a shaved messenger's head, letting his
  hair grow back, then shaving it again when he
  arrived at his contact point

7
Other codes

• Breaking the code carved into the ceiling of the
  Rosslyn Chapel in Scotland reveals a series of
  musical passages. 

http//science.howstuffworks.com/code-breaker.htm/
printable
8
invisible writing

• Another common form of Steganography is through
  the use of Invisible inks.
• Such inks were used with much success as recently
  as WWII.
• An innocent letter may contain a very different
  message written between the lines
• Can you see me
• Early in WWII steganographic technology consisted
  almost exclusively of invisible inks Kahn67.
  Common sources for invisible inks are milk,
  vinegar, fruit juices and urine. All of these
  darken when heated.

9
Steganography

• Art and science of disguising or hiding
  information in the form of something else
• embedding messages within other text
• images or information may be encoded into
  pictures or texts files
• The invisible files can be (compiled and)
  retrieved by those with code

10
Embedding Messages Within Other Text
Null ciphers (unencrypted messages). The real
message is "camouflaged" in an innocent sounding
message.

• Fishing freshwater bends and saltwater coasts
  rewards anyone feeling stressed. Resourceful
  anglers usually find masterful leapers fun and
  admit swordfish rank overwhelming anyday.

• By taking the third letter in each word, the
  following message emerges
• Send Lawyers, Guns, and Money.

Source http//www.jjtc.com/stegdoc/sec202.html
11
The following message was actually sent by a
German Spy in WWII

• Apparently neutral's protest is thoroughly
  discounted and ignored. Isman hard hit. Blockade
  issue affects pretext for embargo on by products,
  ejecting suets and vegetable oils.

• Taking the second letter in each word the
  following message emerges
• Pershing sails from NY June 1

Source http//www.jjtc.com/stegdoc/sec202.html
12
Word-Shifting
By overlapping the two messages you get We
explore new steganographic and cryptographic
algorithms and techniques throughout the world to
produce wide variety and security in the
electronic web called the Internet.

• Expand the space before explore, the, wide, and
  web by one point and condensing the space after
  explore, world, wide and web by one point in
  sentence S1.

13
Embedding Text in Pictures
14
Embedding Messages within photos

• The larger the given message is relative to the
  hidden message, the easier it is to hide it
• For this reason, digital pictures (which contain
  large amounts of data) are used to hide messages
  on the Internet and on other communication media.
  
• a 24-bit bitmap will have 8 bits representing
  each of the three color values (red, green, and
  blue) at each pixel.
• If we consider just the blue there will be 28
  different values of blue.
• The difference between 11111111 and 11111110 in
  the value for blue intensity is likely to be
  undetectable by the human eye.
• Therefore, the least significant bit can be used
  (more or less undetectably) for something else
  other than color information. If we do it with
  the green and the red as well we can get one
  letter of ASCII text for every three pixels.

15
Can you tell the difference?
16
With your parents help
SOURCE http//mozaiq.org/encrypt/ AND
http//mozaiq.org/decrypt/