How can security be enhanced to the maximum in a messaging app storing messaging history on the device (like whatsapp)? I am specifically referring to methods to minimize the risk of the data being stolen in case the device is physically compromised or compromised using malware. I know that whatsapp encrypt the file containing the chat history, nevertheless when you transfer this file between devices you can still open it up with whatsapp and read the contents. So what risk is this protection meant to mitigate? I know that the filesystem restricts access so that only the application can access its files - that means that as long as the device isn't compromised, this information cannot be accessed by a malicious entity. Is this assumption correct? I've seen in another thread that there is an ability to use the SIM card as a means of providing security - Securing data on a mobile device (even from the user/owner)? Is this applicable in my scenario?
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