Compactar String

package guj;

import java.security.SecureRandom;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class ExemploCriptografiaSimples {
    private byte[] salt;
    private PBEKeySpec ks;
    private SecretKey skey;
    private SecretKeyFactory skf;
    private BASE64Decoder dec;
    private BASE64Encoder enc;

    public ExemploCriptografiaSimples() {
        dec = new BASE64Decoder();
        enc = new BASE64Encoder();
    }

    public void senha(char[] chars) throws Exception {
        skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        salt = new byte[4]; // deixamos 4 bytes zerados :(
        ks = new PBEKeySpec(chars, salt, 100, 128);
        skey = new SecretKeySpec(skf.generateSecret(ks).getEncoded(), "AES");
    }

    public String cifrar(String original) throws Exception {
        Cipher cf = Cipher.getInstance("AES/OFB/NoPadding");
        cf.init(Cipher.ENCRYPT_MODE, skey, new IvParameterSpec(new byte[16]));
        return enc.encode(cf.doFinal(original.getBytes()));
    }

    public String decifrar(String cifrado) throws Exception {
        Cipher cf = Cipher.getInstance("AES/OFB/NoPadding");
        cf.init(Cipher.DECRYPT_MODE, skey, new IvParameterSpec(new byte[16]));
        return new String(cf.doFinal(dec.decodeBuffer(cifrado)));
    }

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        ExemploCriptografiaSimples ecs = new ExemploCriptografiaSimples();
        ecs.senha("YjMIzg+3dhgc7a3EPoH/OA==".toCharArray());
        String s = ecs.cifrar("10/11/2010 - 18:06:45 - Local 3A - Profissional 2r");
        // Esperado: "6A63+uTkapyT8h9GNvYaklLyfIVUCxrCZ+7zIE9XRbJyt6f4i7jBs/13JvsLPNSHpm8="
        System.out.println(s);
        String t = ecs.decifrar(s);
        System.out.println(t);
    }

}