Q

$1.$

$$As part of a cryptography assignment, you are required to implement Caesar cipher

algorithms using Python. Follow the instructions provided below to complete the task:

a

$.$

$$Write a Python function called caesar

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cipher that takes two inputs: a plaintext message and

an integer key.

b

$.$

$$Implement the Caesar cipher algorithm to encrypt the plaintext message by shifting each

letter by the given key.

c

$.$

$$Ensure that the function retains the case of the letters and preserves spaces and other nonalphabetic characters.

d

$.$

$$Test the caesar

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cipher function by encrypting the HAHEILOK with a key of

$3$