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dangina [55]
3 years ago
5

Problem 1 (Authentication): Consider the following authentication protocol, which uses a classical cryptosystem. Alice generates

a random message r, enciphers it with the key k she shares with Bob, and sends the enciphered message {r}k to Bob. Bob deciphers it, adds 1 to r, and sends {r + 1}k back to Alice. Alice deciphers the message and compares it with r. If the difference is 1, she knows that her correspondent shares the same key k and is therefore Bob. If not, she assumes that her correspondent does not share the key k and so is not Bob. Does this protocol authenticate Bob to Alice? If so, Why? Otherwise, explain why not.
Computers and Technology
1 answer:
Elis [28]3 years ago
5 0

Answer:

Check the explanation

Explanation:

Yes, going by the question above, the protocol validates Bob to Alice for the reason that the key is only shared between Bob and Alice as well as the number which is being sent randomly. Therefore the invader won’t be able to predict and response to that number. Because of the authentication protocol, that makes use of a classical cryptosystem thereby resulting into the possibility of an argument such that key finding is attainable via invader.

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It is important for a person to upgrade their job skills because upgrading their skills will Increase their self-confidence, Helps to learn new techniques at work, Keep Your Knowledge Up-to-Date, increase your ability  in order to do your job well, and so on.

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7 0
3 years ago
The World Health Organization decided that addiction to video games is considered a mental health disorder. Do you agree or disa
Blababa [14]

Answer:

I disagree and I will tell you why because there was study based on video games and seniors and the theory was that they play games to keep there minds active. I will give you an example let's say you were in a situation and you learned how to make or create something from playing video games, in closeur video games can help us in problems

8 0
3 years ago
When do you use a for loop instead of a while loop? (There may be more than one answer.)
statuscvo [17]

Answer:

- You know how many times you want the loop to run.

- When there is a defined start and end.

Explanation:

Required:

When to use for instead of while loop?

First, it should be noted that both for loop and while loop are used for iteration. However, depending on the scenario; there is preference on one to the other.

The basic syntax of for loop is:

for(start;end;condition)\{\}

<em>The condition could either be increment or decrement</em>

The basic syntax of while loop is:

while(condition)\{\}

<em>The condition could be any condition whatsoever</em>

Analyzing the options one after the other.

1. How many times the loop to run.

The for loop is preferred here because of the simplicity of the for loop.

2. & 3. Both the for and while loops are used for code repetition and to perform number calculations

4. Defined start and end.

From the syntax of the for loop

for(start;end;condition)\{\}

<em />

A for loop has a definite start and end in its basic syntax and is more preferable to use instead of a while loop.

<em />

<em />

Hence, 1 & 4 answer the question

8 0
3 years ago
Liam noticed someone had accessed his social media account and made several posts without his knowledge. Which of the following
jok3333 [9.3K]

Answer:

Liam could

1) Change the password

Be sure to change the password to a "strong" one (containing lots of characters, numbers, symbols) so that way the password would be difficult to guess.

2) Avoid logging onto social media on public computers or WiFi connections.

Using public WiFi leaves you vulnerable to someone accessing your information through Internet traffic. If you do use public computers, just make sure to log out.

3) Avoid giving out account information to friends and avoid opening suspicious links and emails.

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I hope this helped <3 please lmk if there's anything more to add.

4 0
3 years ago
You and a few friends are having a meal at a pizza restaurant, and the server has just given you the bill. Write a function that
cestrela7 [59]

Answer:

How to calculate the total cost of the meal

For bill inclusive of tax, cost1=cost*(1+tax percentage)

For bill inclusive of tax and tip, cost2=cost1*(1+tip percentage)

Meal cost =(pizza cost*(1+tax percentage))*(1+tip percentage)

Now how to calculate the cost per person

cost per person=meal cost/ number of people.

C language code to solve the above problem is given below with appropriate comments for explanation

Explanation:

#include<stdio.h>

float split_bill(int cost,float tax)

{

//Declaring number of people as int

int number;

//Prompting for number of people

printf("Enter number of people ");

scanf("%d",&number);

//Declaring tip percentage as float

float tip_percent;

//Prompting for tip percentage

printf("Enter tip percentage between 0 and 1 ");

scanf("%f",&tip_percent);

//Calculating total meal cost

float meal=(((float)cost)*(1+tax))*(1+tip_percent);

//Printing total cost of meal

printf("Total cost of meal: %0.2f ",meal);

//Calculating cost per person

float cost_per_person=meal/number;

//Returning cost per person to main function

return cost_per_person;

}

int main()

{

//Declaring pizza cost as int and tax percentage as float

int pizza_cost;

float tax_percent;

//Prompting user for pizza cost

printf("Enter billing amount of pizza ");

scanf("%d",&pizza_cost);

//Prompting user for tax percentage

printf("Enter tax percentage between 0 and 1 ");

scanf("%f",&tax_percent);

//Printing the cost per person by calling the function split_bill

printf("Total cost per person is: %0.2f ",split_bill(pizza_cost,tax_percent));

return 0;

}

8 0
3 years ago
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