def b64_d(data)
        iv_and_ctext = []
        data.split('$').each do |part|
          iv_and_ctext << Base64.decode64(part)
        end
        iv_and_ctext
      end
def b64_d(data)
        iv_and_ctext = []
        data.split('$').each do |part|
          iv_and_ctext << Base64.decode64(part)
        end
        iv_and_ctext
      end
Un-Base64's the IV and CipherText
 Returns an array containing the IV, and CipherText