Which of the following is NOT a reason to use cryptography?
2 answers:
Cryptography is not a reason to use when posting photos on a public social media website.
Cryptography is the use of certain techniques that help protect important and personal information from being accessed by other parties. This technological practice or method allows a person to send sensitive or personal information over the internet without risking any "leak" of information.
- Cryptography literally means "hidden writing", which is what the method is all about.
- It presents a safe and secure way of sending or passing information, even personal or sensitive ones.
- This technological method enables businesses and other companies as well as individuals to procure and send information without fearing for any loss of their information.
- Cryptography is mainly used in the military, secret operations, businesses, or even in maintaining one's passwords while using social media platforms or submitting a password on a website.
- One reason to not use it is when posting photos on social media websites as the website is to be used by the web world and may/can be accessed by everyone around the world.
Cryptography not only allows a person to maintain certain privacy and security but also help the smooth functioning of businesses and other national security works. Thus, cryptography is the "security" of individuals in the 'internet world'.
Learn more about cryptography here:
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Answer:
Here is the recursive function sumSquares(num) that takes an integer num as parameter and returns the sum of squares of numbers from 1 to num.
def sumSquares(num):
if(num >= 0): # checks if the value of num is less than or equal to 0
if (num==0): #if value of num is 0
return 0 #returns 0 if value of num is 0
else: #if value of num is greater than 0
return sumSquares(num - 1)+ num * num #recursively calls the sumSquares method to return the sum of squares of numbers from 1 to num
else: # if a user enters a negative num
(print("The number if not positive")) #prints this message
exit() # exits after displaying that number if not positive message
#below print statement is used in order to check the working of the function
print(sumSquares(3)) #calls function and passes value 3 for num
Explanation:
The program works as follows:
The function sumSquares(num) that takes an integer num as parameter and returns the sum of squares of numbers from 1 to num
The first if condition checks if value of num is positive. If this condition evaluates to true then the another if statement inside this if statement is executed which checks if the value of num is 0. If this condition evaluates to true then the program returns 0. However if this condition evaluates to false then the else part executes which has the following statement:
return sumSquares(num - 1) + num * num
For example num = 3
so the above recursive statement works as follows:
sumSquares(3-1) + 3 * 3
sumSquares(2) + 9
Note that the sumSquares() method is called again and the value 2 is passed as num. As 2 is greater than 0. So again the recursive statement executes:
sumSquares(2 - 1) + 2 * 2 + 9
sumSquares(1) + 4 + 9
sumSquares(1) + 13
sumSquare() method is called again and the value 1 is passed as num. As 1 is greater than 0. So again the recursive statement executes:
sumSquares(1 - 1) + 1 * 1 + 13
sumSquares(0) + 1 + 13
sumSquares(0) + 14
sumSquare() method is called again and the value 0 is passed as num
As the value of num=0 So the if (num == 0): condition evaluates to true and the statement returns 0 executes which returns 0:
sumSquares(0) + 14
0 + 14
Hence the output is:
14
The screenshot of the program along with its output is attached.
