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Write a Java code for the following requirement.

File encryption is the science of writing the contents of a file in a secret code.

The encryption program should work like a filter, reading the contents of one file, modifying the data into code, and then writing the code contents out to a second file. The second file will be a version of the first file, but written in a secret code.

Although there are complex encryption techniques, you should come up with a simple one of your own. For example, you could read the first file one character at a time and add 10 to the character code of each character before it is written to the second file.

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  1. 5 May, 04:11
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    import java. io. File;

    import java. io. FileInputStream;

    import java. io. FileNotFoundException;

    import java. io. FileOutputStream;

    import java. io. IOException;

    import java. util. Scanner;

    public class EncryptFileData

    {

    public static void main (String args[]) throws IOException, FileNotFoundException

    {

    String inputFileName="input. txt";

    String outputFileName="EncryptedFile. txt";

    String decryptFileName="DecryptedFile. txt";

    byte codeValue;

    Scanner sc=new Scanner (System. in);

    //Accept code value from user

    System. out. println ("Enter the value of code");

    codeValue=sc. nextByte ();

    //Encrypt the input file

    encryptFileContent (inputFileName, codeValue, outputFileName);

    //Decrypt the input file

    decryptFileContent (outputFileName, codeValue, decryptFileName);

    }

    //function to encrypt the input file

    private static void encryptFileContent (String inputFileName,

    byte encodeValue, String outputFileName) throws IOException, FileNotFoundException{

    File file = new File (inputFileName);

    FileInputStream fin = new FileInputStream (file);

    FileOutputStream fout = new FileOutputStream (outputFileName);

    try{

    while (fin. available () ! = 0) {

    int inData = fin. read ();

    //For every character in input add code value and

    //write result to file "EncryptedFile. txt"

    fout. write (inData+encodeValue);

    }

    }finally{

    fin. close ();

    fout. close ();

    }

    }

    //function to decrypt the encrypted file

    private static void decryptFileContent (String inputFileName,

    byte encodeValue, String outputFileName) throws IOException, FileNotFoundException{

    File file = new File (inputFileName);

    FileInputStream fin = new FileInputStream (file);

    FileOutputStream fout = new FileOutputStream (outputFileName);

    try{

    while (fin. available () ! = 0) {

    int inData = fin. read ();

    //For every character in encrypted file

    //subtract the code value from each character and

    //write it to file "DecryptedFile. txt"

    fout. write (inData-encodeValue);

    }

    }finally{

    fin. close ();

    fout. close ();

    }

    }

    }

    Explanation:

    Given the following conditions to follow in the question;

    => "The encryption program should work like a filter, reading the contents of one file, modifying the data into code, and then writing the code contents out to a second file. "

    => "The second file will be a version of the first file, but written in a secret code."

    Thus, the Java code is given below (one can just copy and run it to give a sample output of: Enter the value of code 1 2.

    The Java code is;

    import java. io. File;

    import java. io. FileInputStream;

    import java. io. FileNotFoundException;

    import java. io. FileOutputStream;

    import java. io. IOException;

    import java. util. Scanner;

    public class EncryptFileData

    {

    public static void main (String args[]) throws IOException, FileNotFoundException

    {

    String inputFileName="input. txt";

    String outputFileName="EncryptedFile. txt";

    String decryptFileName="DecryptedFile. txt";

    byte codeValue;

    Scanner sc=new Scanner (System. in);

    //Accept code value from user

    System. out. println ("Enter the value of code");

    codeValue=sc. nextByte ();

    //Encrypt the input file

    encryptFileContent (inputFileName, codeValue, outputFileName);

    //Decrypt the input file

    decryptFileContent (outputFileName, codeValue, decryptFileName);

    }

    //function to encrypt the input file

    private static void encryptFileContent (String inputFileName,

    byte encodeValue, String outputFileName) throws IOException, FileNotFoundException{

    File file = new File (inputFileName);

    FileInputStream fin = new FileInputStream (file);

    FileOutputStream fout = new FileOutputStream (outputFileName);

    try{

    while (fin. available () ! = 0) {

    int inData = fin. read ();

    //For every character in input add code value and

    //write result to file "EncryptedFile. txt"

    fout. write (inData+encodeValue);

    }

    }finally{

    fin. close ();

    fout. close ();

    }

    }

    //function to decrypt the encrypted file

    private static void decryptFileContent (String inputFileName,

    byte encodeValue, String outputFileName) throws IOException, FileNotFoundException{

    File file = new File (inputFileName);

    FileInputStream fin = new FileInputStream (file);

    FileOutputStream fout = new FileOutputStream (outputFileName);

    try{

    while (fin. available () ! = 0) {

    int inData = fin. read ();

    //For every character in encrypted file

    //subtract the code value from each character and

    //write it to file "DecryptedFile. txt"

    fout. write (inData-encodeValue);

    }

    }finally{

    fin. close ();

    fout. close ();

    }

    }

    }
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