PYTHON

Exercises 1:

Implement a simple encryption algorithm that works as follows:

The algorithms use a numerical private key named key.

Each character in the original text is encrypted as the character resulting from multiplying the ASCII code of that character with the key. For example to encrypt A

enc_char = chr(ord (A) * key)

A. Write a function named ecrypt_file that takes as an argument the file name to be encrypted, the name of the output file (where to store the encrypted text), and the encryption key. The function opens the first file, encrypted the text according to the algorithm above, and stores the encrypted text in the second file.

B. Write a multithreaded program that attempts to encrypt the contents of 10 different files concurrently using the function ecrypt_file defined in the previous step. You need to create one thread of execution to process each file. Your program asks the user to input the names of the text files to be encrypted.

Exercises 2:

For this question, only consider the usual" alphabet composed of characters in [A-Z]. You can assume that all the input values will be valid.

Implement a SimpleCipher class as a subclass of threading (Thread).

The SimpleCipher has:

A data member called private_key.

A proper constructor.

A method called ecrypt_file takes as an argument the file name to be encrypted and the name of the output file (where to store the encrypted text).

The method opens the first file and encrypted the text according to the following algorithm:

A. Each letter in the original file is replaced by letter n positions to the right down the alphabet (if you reach the Z continue from the A); for example, if n is 2, then the letter B is replaced by D, and the letter Y is replaced by A, and so on. n is the private_key. Characters not in the range [A-Z] are not encrypted.

B. Write a multithreaded program that attempts to encrypt the contents of 10 different files concurrently using the SimpleCipher class defined in the previous step. You need to create one thread of execution to process each file. Your program asks the user to input the names of the text files to be encrypted.