title: Xamarin failed to resolve system.security.cryptography?
body: <p>How would I solve this in Xamarin:</p>
  
  <blockquote>
    <p>Failed to resolve
    System.Security.Cryptography.SHA256CryptoServiceProvider reference
    from System.Core, Version 4.0.0, Culture=Neutral,
    PublicKeyToken=b77a5c561934e089" (MT2002)</p>
  </blockquote>
  
  <p>I am finding great difficulty with this problem as it has popped out of nowhere when running my solution on a real device rather than on a simulator.I would greatly appreciate any help :) </p>