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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.

Respuesta :

codedmog101

Answer:

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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