Your task is to implement a cryptographic system, using Java, that encrypts/decrypts all text files in a given folder or single text file. Your system should allow the user to choose between RSA or AES. You should demonstrate that your system is working properly regardless of the chosen algorithm, input key, or amount of files and their content. Check the sample run section. The general steps to encrypt/decrypt a file in Java are as follows. 1. Get the key(s) from the user. RSA algorithm requires two keys (public and private) of 2048-bit while AES operates on a default key size of 192 bits. 2. Create an instance of the class Cipher for the chosen algorithm transformation. Refer to the document of the Cipher class for more information regarding supported algorithms and transformations. 3. Initialize the Cipher with an appropriate mode (encrypt or decrypt) and the given Key.

Your task is to implement a cryptographic system, using Java, that encrypts/decrypts all text files in a given folder or single text file. Your system should allow the user to choose between RSA or AES. You should demonstrate that your system is working properly regardless of the chosen algorithm, input key, or amount of files and their content. Check the sample run section. The general steps to encrypt/decrypt a file in Java are as follows. 1. Get the key(s) from the user. RSA algorithm requires two keys (public and private) of 2048-bit while AES operates on a default key size of 192 bits. 2. Create an instance of the class Cipher for the chosen algorithm transformation. Refer to the document of the Cipher class for more information regarding supported algorithms and transformations. 3. Initialize the Cipher with an appropriate mode (encrypt or decrypt) and the given Key.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Your task is to implement a cryptographic system, using Java, that encrypts/decrypts all text files in a given folder or
single text file. Your system should allow the user to choose between RSA or AES.
You should demonstrate that your system is working properly regardless of the chosen algorithm, input key, or amount of
files and their content. Check the sample run section.
The general steps to encrypt/decrypt a file in Java are as follows.
1. Get the key(s) from the user. RSA algorithm requires two keys (public and private) of 2048-bit while AES operates
on a default key size of 192 bits.
2. Create an instance of the class Cipher for the chosen algorithm transformation. Refer to the document of the
Cipher class for more information regarding supported algorithms and transformations.
3. Initialize the Cipher with an appropriate mode (encrypt or decrypt) and the given Key.
4. Invoke doFinal(input_bytes) method of the Cipher class to perform encryption or decryption on the
input_bytes, which returns an encrypted or decrypted byte array.
5. Read an input file to a byte array and write the encrypted/decrypted byte array to an output file accordingly.
A code snippets from the main() method is provided below. Your code may look different though!
String filename =
filelst[i];
File inputFile = new File(filename);
// to encrypt
File encryptedFile = new File(filename + ".encrypted");
// to decrypt
File decryptedFile = new File(filename + ".decrypted");
try {
Crypto.encrypt(key, inputFile, encryptedFile);
Crypto.decrypt(key, encryptedFile, decryptedFile);
} catch (CryptoException ex) {
System.out.println(ex.getMessage());
ex.printStackTrace ();
}

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