title: rijndael 256 key
body: <p>How can I create a key and iv, so that encrypted string should only contain digits and characters.key string and iv string should contain 32 characters.purpose is encrypted string should not contain any special characters.block size is 256.
  now I am using key and iv like this.after encryption using this, getting encrypted string with special characters.how can we avoid this.</p>
  
  <p>AES_Key=PSVJQRk9QTEpNVU1DWUZCRVFGV1VVT0ZOV1RRU1NaWQ=</p>
  
  <p>Aes_iv=YWlFLVEZZUFNaWlhPQ01ZT0lLWU5HTFJQVFNCRUJZVA=</p>