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3 years ago

CodeLab is

Computers and Technology

1 answer:

WARRIOR [948]3 years ago

6 0

Answer:C)an online set of interactive exercises with immediate feedback

Explanation: CodeLab is defined as the program that is online based an provides the services like giving knowledge about computer programming, learning etc.It has the ability to be accessed from anywhere in the world and provides the results just after activities are done on it.

Other options are incorrect because these are online services but not related with knowledge of computer program.Thus ,the correct option is option(C).

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3 years ago

a) Write a program that prompts for an integer—let’s call it X—and then finds the sum of X consecutive integers starting at 1. T

Alex73 [517]

Answer:

Solution a

n = int(input("Enter an integer: "))
sum = 0
for x in range(1, n+1):
sum += x
print(sum)

Solution b

n = int(input("Enter an integer: "))
for a in range(1, n + 1):
sum = 0
for x in range(1, a+1):
sum += x
print(sum)

Explanation:

Solution code is written in Python 3.

Solution a

First get the user input for an integer (Line 1).

Create a variable sum and initialize it with zero value (Line 3).

Create a for loop to traverse through the number from 1 to integer n (inclusive) and sum up the current number x (Line 5-6).

Print the sum to terminal (Line 8).

Solution b

Create an outer for loop that traverse through the number from 1 to integer n (inclusive) (Line 3).

Create an inner loop that traverse through the number from 1 to current a value from the outer loop and sum up the current x value (Line 5-6).

Print the sum to terminal (Line 7) and proceed to next iteration and reset the sum to zero (Line 4).

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3 years ago

Assume that you are able to do an exhaustive search for the key to an encrypted message at the rate of 100 Million trials per se

Len [333]

Answer:

Following are the solution to this question:

Explanation:

In point 1:

Trials frequency $= \frac{100 \ million }{second}$

calculating the main length of cryptography = 112 bit

$\to 100\ Million = 1 \times 10^8$

calculating the second year value:

$\to 365 \times 24 \times 60 \times 60 =3153600\\\\$

$=3.15 \times 10^7 \ seconds$

Currently, in average , at least half the possible sleeves is being used to verify the encryption process: $2^{111} \ keys$

$\to \frac{2^{111} \time3s 10^6}{3.15 \times 10^7}\approx 8.22 \times 10^{20} \ years$

the total time value will be $8.22 \times 10^{20} \ years$

In point 2:

In cryptography, the common name is Triple DES (3DES), which would be the symmetric-key encrypted communication algorithm (TDEAor Triple DEA), which adds 3 times per block size only with the cryptographic method Data Encryption Standard ( DES).

Algorithm:-

The key package involves four DES keys, K1, K2, and K3, each 56-bit (except parity bits), Triple DES includes. Its encoding algorithm is::

$ciphertext = EK3(DK2(EK1(plaintext)))$

I.e. K1, DES encrypt, K2 decrypt, then K3 encrypt DES.

The reverse is the decryption:

$plaintext = DK1(EK2(DK3(ciphertext)))$

I.e. decrypt by K3, crypt by K2, decrypt by K1.

Every three-bit authentication encrypts a 64-bit block.

Its middle procedure in each situation it's the reverse of the first operation. It improves the strength of the key second option algorithm which offers DES native support with key option 3.

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3 years ago