import java.io.*; import java.security.*; import javax.crypto.*;

class EncryptAndDecrypt {

public static void main (String[] args) throws Exception{ KeyPairGenerator keygenerator = KeyPairGenerator.getInstance("RSA"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN"); keygenerator.initialize(1024, random);

KeyPair keypair = keygenerator.generateKeyPair(); PrivateKey privateKey = keypair.getPrivate(); PublicKey publicKey = keypair.getPublic(); Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, publicKey); String st= "roseindia"; byte[] cleartext = null; cleartext = st.getBytes(); byte[] ciphertext = null; ciphertext = cipher.doFinal(cleartext); System.out.println("the encrypted text is: " + ciphertext.toString());

cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] cleartext1 = cipher.doFinal(ciphertext); System.out.println("the decrypted cleartext is: " + new String(cleartext1)); } }

make a package and import it into servlet or write this code in servlet directly also

take care have a nice day