@Override
    public void map(Text key, Text value, Context context)
        throws IOException, InterruptedException {
      byte[] randomIV = crypto.randomBytes(AES_BLOCK_SIZE);

      byte[] pt = new byte[KEY_LENGTH + VALUE_LENGTH];
      System.arraycopy(key.copyBytes(), 0, pt, 0, KEY_LENGTH);
      System.arraycopy(value.copyBytes(), 0, pt, KEY_LENGTH, VALUE_LENGTH);
      // byte[] ct = crypto.encrypt_word_rnd(value.toString(), randomIV);
      byte[] ct = crypto.encrypt_word_cbc(pt, randomIV);
      System.out.println("ct size = " + ct.length);
      context.write(new BytesWritable(randomIV), new BytesWritable(ct));
    }