Expert answer:cryptography

Solved by verified expert:For this assignment, you will write an essay on the video for this week:Advanced JPEG Steganography and DetectionIn this essay, discuss what you have learned on steganography and how this relates to cryptography today. Provide a few examples of how steganography is able to conceal information. In addition to the video, choose one other scholarly reference to support your discussion.Requirements:Submit in a Word document.Include cover pageMust be a minimum of two pages (excluding references and cover page)Appropriate APA format is required.Properly cite and reference any borrowed resource(s)
RubricContentProficient81 – 100 pointsAcceptable61 – 80 pointsBelow Standard0 – 60 pointsTotal Content is relevant, well-selected, and demonstrates good understanding of technologies that are required for this course.Content is somewhat relevant, well-selected, and demonstrates a general understanding of technologies that are required for this course.Content is not relevant, not well-selected, and does not demonstrate a general understanding of technologies that are required for this course.Grammar and FormatProficient81 – 100 pointsAcceptable61 – 80 pointsBelow Standard0 – 60 points Content demonstrates exceptional spelling and grammar. Content flows well and to enhance communication. Few or no errors that they do not impede overall readability.Content demonstrates acceptable spelling and grammar. Content flows well and to enhance communication. Few or no errors that they do not impede overall readability.Content does not demonstrate acceptable spelling and grammar. Content does not flow well and does not enhance communication. Multiple errors impede overall readability.video link:
chapter_3_components_of_cryptography.pptx

Unformatted Attachment Preview

Components of Cryptography
Chapter 3
Categories of Cryptosystems
Organization of
Cryptosystems
Two-Way
Cryptography
Symmetric
Stream
Steganography
Asymmetric
Block
Factoring the
Product of
Large Primes
Discreet
Logarithms
Message
Integrity
Controls
Steganography
• Art of hiding information
• Plaintext hidden/disguised
• Prevents a third party from knowing that a secret message exists
• Traditionally accomplished in a number of ways:
• Physical techniques
• Null ciphers
Null Cipher
• Example Cipher text:
News Eight Weather: Tonight increasing snow. Unexpected precipitation
smothers eastern towns. Be extremely cautious and use snowtires
especially heading east. The highway is not knowingly slippery. Highway
evacuation is suspected. Police report emergency situations in
downtown ending near Tuesday.
• Taking the first letter in each word successively yields the real
message: “Newt is upset because he thinks he is President.”
Image-based Steganography
• RGB* values altered to contain a message
E1089197693F6C4C26E0033F8C8AF00C
• File sizes are identical
• Different hash values
57694B77DCB55C543C6C0BA8E1FF2D17
Digital Watermarking
• Digital watermarks are visible or invisible markings embedded within
a digital file to indicate copyright or other handling instructions, or to
embed a fingerprint to detect unauthorized copying and distribution
of images
Substitution and Transposition
Simple
Polyalphabetic
Substitution
Running Key
Cryptography
Codes
Transposition
Scytale
Substitution Ciphers
• Four-square
• Playfair
• Caesar Cipher:
• Shift (rotate) alphabet (move letters three spaces)
• A B C D E F … BAD
• D E F G H I … EDG
• Scramble alphabet:
• Substitute one letter for another
• A B C D E F … BAD
• Q E Y R T M … EQR
Polyalphabetic Ciphers – Vigenère Cipher
This is a simple substitution cipher that uses
multiple alphabets rather than just one
Encrypt the plaintext ‘FEEDBACK’ using a key of
3241
Running Key Ciphers
• Use the value of
plaintext letters and
a value of key based
on a shared book
Value of Message
‘THIS message …’
+ Value of Key
‘on periodic …’
= Value of Ciphertext
One-time Pads (OTPs)
• The keys are the same size (length) as the plaintext message, and the
keys must be randomly generated for this scheme to be truly
effective
• It is the requirement for randomness that makes OTPs particularly
challenging to generate, since the best that we can typically achieve
when generating such pads using computer processors are pseudorandom values
Codes
• A group of navy ships is operating under conditions of radio silence
to avoid detection by the enemy
• Maneuvering signals and comments are communicated by flag
signals
• A separate flag is used for each letter
• To send a paragraph of information would be a real workout for the
signalmen, so codes are used to minimize the effort and time
involved; for instance, the letters BZ are the signal that the addressee
performed well or did a good job
Transposition Ciphers
• Columnar – rearranging the
message in a table
• Plaintext “This is an example of
transposition”
• Ciphertext
“tsaonihamfstinptpiselrooixeasn”
• Key: grid shape and reading
direction
• Example: the Spartan Scytale
…
Purchase answer to see full
attachment

How it works

1. Paste your instructions in the instructions box. You can also attach an instructions file
2. Select the writer category, deadline, education level and review the instructions 
3. Make a payment for the order to be assignment to a writer
4.  Download the paper after the writer uploads it 

Will the writer plagiarize my essay?

You will get a plagiarism-free paper and you can get an originality report upon request.

Is this service safe?

All the personal information is confidential and we have 100% safe payment methods. We also guarantee good grades