Code C  Can this be done as a flowchart please? Detailed and clear This week’s exercise is to implement an encoder. When completed, your program should be able to accept a short sentence from the user and display an encrypted version of it. Encryption is a complex subject but we can implement a very simple example as follows

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Can this be done as a flowchart please? Detailed and clear

This week’s exercise is to implement an encoder. When completed, your program should be able to accept a short sentence from the user and display an encrypted version of it. Encryption is a complex subject but we can implement a very simple example as follows. For simplicity, let us assume one case of letters throughout, say CAPITALS. We can use a substitution method to scramble a sentence and then use the reverse of this process to recover it. If we take two rows of the alphabet and shift the bottom row along a specified amount (our key), we can then read the letters in our sentence from the top row and use the substituted letter from the bottom row to form the encrypted sentence: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z X Y Z A B C D E F G H I J K L M N O P Q R S T U V W In the example above, the key is 3, hence the second row is shifted by three characters along. Take, for instance, the sentence “HELLO”. Each letter of your message should be replaced by the letter in the alphabet that comes three letters before. For “HELLO” that would be: EBIIL

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