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ivann1987 [24]
3 years ago
14

What is your understanding of the difference between a stream cipher and a block cipher?

Computers and Technology
1 answer:
Mars2501 [29]3 years ago
4 0

Answer:

In a stream cipher, the information is ciphered byte-by-byte.

In a block cipher, the information is ciphered block by block.

Explanation:

Suppose I have the following text:

Buffalo Bills New England Patriots

New York Jets Miami Dolphins

Each line is one byte, so, on the stream cipher, i am going to apply the ciphering algorithm on:

The letter B

The letter u

The letter f

Until

The letter s(of Miami Dolphins)

Now for the block cipher, i am saying that each line is a block, so the algorithm is going to be applied.

First on: Buffalo Bills New England Patriots

Then: New York Jets Miami Dolphins

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pishuonlain [190]

Answer:

1.  A high level algorithm for cooking a cheeseburger could be:

  1. Heat fry pan
  2. Cook one side of the hamburger
  3. Wait
  4. Turn hamburger upside down
  5. Put cheese over hamburger
  6. Wait
  7. Cut hamburger bread in half
  8. Put cooked hamburger inside bread
  9. End (eat)

2. A detailed algorithm for cooking a cheeseburger could be:

  1. Place fry pan over the stove heater
  2. Turn on heater (max temp)
  3. IF fry pan not hot: wait, else continue
  4. Place raw hamburger on fry pan
  5. IF hamburger not half cooked: Wait X time then go to line 5, else continue
  6. Turn hamburger upside down
  7. Put N slices of cheese over hamburger
  8. IF hamburger not fully cooked: Wait X time then go to line 8, else continue
  9. Turn off heater
  10. Cut hamburger bread in half horizontally
  11. Put cooked hamburger on one of the bread halves.
  12. Put second bread half on top of hamburger
  13. End (eat)

Explanation:

An algorithm is simply a list of steps to perform a defined action.

On 1, we described the most relevant steps to cook a simple cheeseburger.

Then on point 2, the same steps were taken and expanded with more detailed steps and conditions required to continue executing the following steps.

In computational terms, we used pseudo-code for the algorithm, since this is a list of actions not specific to any programming language.

Also we can say this is a structured programming example due to the sequential nature of the cooking process.

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