It is more commonly called cascade encryption.<p>The problem is that in many cases you can&#x27;t afford to sacrifice enough performance for it.<p>Also, malware and crypto doesn&#x27;t &quot;play in the same field&quot;. Malware is solved by secure programming, access controls and users that are educated to not fall for trojans.<p>Encryption handles communication and storage, and only to a small degree data processing.