Project Submission:<\/p>\n
Following is required for Final Project <\/p>\n
Source code of any cryptographic Algorithm RSA. <\/p>\n
Source code should contain following operations<\/p>\n
a. Key Generation<\/p>\n
b. Data (Alphanumeric) Encryption <\/p>\n
c. Data (Alphanumeric) Decryption<\/p>\n
This part done by me <\/p>\n
Project Report with <\/p>\n
a. Introduction of the project work<\/p>\n
b. Complete details of the Project Cryptographic Algorithm ( RSA ) <\/p>\n
c. Source Code <\/p>\n
import java.util.*;<\/p>\n
import java.lang.*;<\/p>\n
import java.io.*;<\/p>\n
import java.math.*;<\/p>\n
class RsaAlgorithm {<\/p>\n
public Random r;<\/p>\n
public int bitlength = 1024;<\/p>\n
public BigInteger p;<\/p>\n
public BigInteger q;<\/p>\n
public BigInteger N;<\/p>\n
public BigInteger phi;<\/p>\n
public BigInteger e;<\/p>\n
public BigInteger d;<\/p>\n
public static String bytesToString(byte[] encryptedString) {<\/p>\n
String test = “”;<\/p>\n
for (byte b : encryptedString) {<\/p>\n
test += Byte.toString(b);<\/p>\n
}<\/p>\n
return test;<\/p>\n
}<\/p>\n
\/\/ encrypting the message<\/p>\n
public byte[] encryption(byte[] message) {<\/p>\n
return (new BigInteger(message)).modPow(e, N).toByteArray();<\/p>\n
}<\/p>\n
\/\/ decrypting the message<\/p>\n
public byte[] decryption(byte[] message) {<\/p>\n
return (new BigInteger(message)).modPow(d, N).toByteArray();<\/p>\n
}<\/p>\n
public RsaAlgorithm() {<\/p>\n
r = new Random();<\/p>\n
p = BigInteger.probablePrime(bitlength, r);<\/p>\n
q = BigInteger.probablePrime(bitlength, r);<\/p>\n
N = p.multiply(q);<\/p>\n
phi = p.subtract(BigInteger.ONE).multiply(q.subtract(BigInteger.ONE));<\/p>\n
e = BigInteger.probablePrime(bitlength \/ 2, r);<\/p>\n
while (phi.gcd(e).compareTo(BigInteger.ONE) > 0 && e.compareTo(phi) < 0) {<\/p>\n
e.add(BigInteger.ONE);<\/p>\n
}<\/p>\n
d = e.modInverse(phi);<\/p>\n
}<\/p>\n
public RsaAlgorithm(BigInteger e, BigInteger d, BigInteger N) {<\/p>\n
this.e = e;<\/p>\n
this.d = d;<\/p>\n
this.N = N;<\/p>\n
}<\/p>\n
@SuppressWarnings(“deprecation”)<\/p>\n
public static void main(String[] args) throws java.lang.Exception {<\/p>\n
String inp;<\/p>\n
DataInputStream in = new DataInputStream(System.in);<\/p>\n
RsaAlgorithm rsa = new RsaAlgorithm();<\/p>\n
System.out.println(“Salem Alhosani – A00049893 (RSA)”);<\/p>\n
System.out.println(“Enter the private Message:”);<\/p>\n
inp = in.readLine();<\/p>\n
System.out.println(“Encrypting the given String: ” + inp);<\/p>\n
System.out.println(“String in Bytes: ” + bytesToString(inp.getBytes()));<\/p>\n
\/\/ encryption is performed first<\/p>\n
byte[] encryptedString = rsa.encryption(inp.getBytes());<\/p>\n
\/\/ decryption<\/p>\n
\/\/ at second stage<\/p>\n
byte[] decryptedString = rsa.decryption(encryptedString);<\/p>\n
System.out.println(“Decrypting Bytes: ” + bytesToString(decryptedString));<\/p>\n
System.out.println(“Decrypted String recieved : ” + new String(decryptedString));<\/p>\n
}<\/p>\n
}<\/p>\n
d. Screen shots of code execution.<\/p>\n","protected":false},"excerpt":{"rendered":"
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