Deliverables

Post these on your web site. Follow my set up = "Deliverables" > 1.4.3 Conclusion

1.4.3 Conclusion

• There are ways to send secret information in photographs using the lowest-place-value bits in each color byte. Concealing information in an image is called steganography. The 1s place and 2s place of each RGB pixel intensity could be changed to encode the numbers 0 to 63, more than enough for the alphabet.
  1. Explain why these 6 bits are of least significance in the image representation.
  2. Explain why 6 bits are enough to encode 0 to 63.
  3. How would this make the image look different?
• If you google “Python image analysis,” you can find several Python libraries that will analyze an image. At least one library has a method or function that can determine how many separate objects are in the image. In very rough terms, describe how you think such an algorithm might acquire this information from the RGB pixel values.

1.4.4

I need to see both code and girl's eyes. DO BOTH EYES (not just one).

# Open and show the student image in a new Figure window student_img = PIL.Image.open(student_file) fig, ax = plt.subplots(1, 2) ax[0].imshow(student_img, interpolation='none') # Display student in second axes and set window to the right eye ax[1].imshow(student_img, interpolation='none') ax[1].set_xticks(range(1050, 1410, 100)) ax[1].set_xlim(1050, 1400) # Measure in plt, experiment in IPython ax[1].set_ylim(1100, 850) fig.show()

1.4.5

Rounded corners

Save the code using a different file name and modify it to accomplish the following objectives. Your code should include two new functions modeled after round_corners_one_image() and round_corners_of_all_images().

1. Create a function frame_all_images(color, wide) that makes a framed version of all pictures in a directory, where the frame is specified by a color (r,g,b) and has thickness wide.
2. Create a function alter_all_images() that makes a new version of all pictures in a directory, with the modification being of your own design.

Conclusions:

• Icons on the desktop are not usually rectangular. You can see through the desktop behind their irregular edges. How is this accomplished?
• You have 2000 images and would like thumbnails of all of them so that they will be transparent in their corners. Describe the algorithm you would use to accomplish this.
• The code provided was divided into three functions. Describe how this made the code reuse easier.

1.4.6

• How did you feel about digital privacy before this activity? How has your understanding of digital privacy changed?
• How did you feel about copyright law before this activity? How has your understanding of copyright law changed?
• In one or two paragraphs, summarize who gets to own what sort of bits in the United States.

2.1.

• 1. In what ways have social interactions amongst people changed as a result of technologies that rely on or build upon the Internet?
• 2. The IPv4 protocol did not have enough addresses for all computers to use, even though it seemed nearly infinite when the protocol was created. Will IPv6 eventually run out of addresses? Explain.
• 3. How does the autonomous nature of domain name allocation facilitate the growth of the Internet?
• 4. Why do we break up data into packets to pass information through the Internet?
• 5. Describe one positive and one negative effect of the Internet on society.

2.1.2

• What is the basic function of the cookie and where is it stored?

2.1.3

• Match each protocol on the left with its purpose on the right.

• Why are protocols necessary?
• Why do protocols get outdated?
• How do governmental agencies, corporations, and non-governmental organizations affect the development and functioning of the Internet?

2.1.5

Explain the relationship among the following concepts.

• The https:// designation in your browser
• Public key encryption
• SSL certificate
• Certificate Authority
• Domain name

2.3.1

• The introduction compared practicing cyber hygiene to washing hands. How are they similar?

2.3.2

• What is the difference between theoretically and empirically analyzing an algorithm?
• Creating a new and more efficient algorithm for a common problem like searching, sorting, aligning, encrypting, or factoring can be a tremendous discovery. Why?
• Why does Internet security depend on processing speed and the time complexity of algorithms?