Vigenere cipher Program plan: In the file “ VigenereCipher.java ”, import necessary packages and create a class “ VigenereCipher”, Declare string variable. Define the constructor to initialize the variables. Define the method “processStream()” to process the contents of a stream. Define the method “process()” to process a single byte for encryption or decryption. In the file “ Encryptor.java ”, i mport necessary packages and create a class “ Encryptor”, Define the method “main()”, Initialize the necessary variables. Execute “try” statement, Initialize the variable. Execute “while” loop till the length of the argument, If the argument id “-d”, Set the Boolean value to true. Otherwise check if the argument is “-k”, Increment the value by 1. Check the condition, If it is true, set the key. Otherwise, if the input file is null, Get the input file. Otherwise, if the output file is null, Get the output file. If either the input or output or key is null, Print the string. Otherwise, Create the input stream. Create the output stream. Create an object for “VigenereCipher”. Call the method “processStream()”. Close the input and output file. Catch if exception occur, Handle the exception.

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Chapter 21, Problem 3PP

Program Plan Intro

Vigenere cipher

Program plan:

In the file “VigenereCipher.java”, import necessary packages and create a class “VigenereCipher”,

Declare string variable.

Define the constructor to initialize the variables.

Define the method “processStream()” to process the contents of a stream.

Define the method “process()” to process a single byte for encryption or decryption.

In the file “Encryptor.java”, import necessary packages and create a class “Encryptor”,

Define the method “main()”,

Initialize the necessary variables.

Execute “try” statement,

Initialize the variable.

Execute “while” loop till the length of the argument,

If the argument id “-d”,

Set the Boolean value to true.

Otherwise check if the argument is “-k”,

Increment the value by 1.

Check the condition,

If it is true, set the key.

Otherwise, if the input file is null,

Get the input file.

Otherwise, if the output file is null,

Get the output file.

If either the input or output or key is null,

Print the string.

Otherwise,

Create the input stream.

Create the output stream.

Create an object for “VigenereCipher”.

Call the method “processStream()”.

Close the input and output file.

Catch if exception occur,

Handle the exception.

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