Universal Containers (UC) is using a custom application that will act as the Identity Provider...

Using the identity provider’s certificate to digitally sign and encrypt the payload, and usinga custom login flow to retrieve sensitive data using an Apex callout without including the attributes in the assertion are two methods that can ensure that the sensitive data cannot be tampered with, nor accessible to anyone while in transit. Option A is not a good choice because using Salesforce’s certificate to encrypt the payload may not work, as Salesforce does not support encrypted SAML assertions. Option B is not a good choice because using Salesforce’s certificate to digitally sign the SAML assertionmay not be necessary, as Salesforce does not validate digital signatures on SAML assertions. Also, using a mobile device management client on the users’ mobile devices may not be relevant, as it does not affect how the sensitive data is transmitted between the identity provider and Salesforce.