title: Encrypting sensivite data in React Native and Expo
body: <p>I`m working on mobile app with React Native and <a href="https://expo.io/" rel="noreferrer">Expo</a>, providing security solutions. Project owner want to store in app sensitive authorization keys, used to contact with REST server and  access to secured data. He demand to have this keys at least encrypted, and hard to read from outside as much as possible.</p>
  
  <p>I know about topis: </p>
  
  <p><a href="https://stackoverflow.com/questions/39028755/save-sensitive-data-in-react-native">Save sensitive data in React Native</a></p>
  
  <p><a href="https://stackoverflow.com/questions/39148714/is-react-natives-async-storage-secure">Is React Native&#39;s Async Storage secure?</a></p>
  
  <p>and about <code>KeyChain</code>, but they dont cover encyption and expo issues.</p>
  
  <p>So with is the best and common solution for making this data save as possible in React Native <a href="https://expo.io/" rel="noreferrer">Expo</a> app?</p>