More work on classes.

description.md

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-Security and Privacy are emerging as very important research areas.
+Security and Privacy are rapidly emerging as critical research areas.
 Vulnerabilities in software are found and exploited almost everyday
-and with disastrous consequences (e.g., the Equifax massive data
-breach).  Moreover, our private data is increasingly at risk and thus
+and with increasingly serious consequences (e.g., the Equifax massive data
+breach). Moreover, our private data is increasingly at risk and thus
 techniques that enhance privacy of sensitive data (known as
 privacy-enhancing technologies (PETS)) are becoming increasingly
 important. Also, machine-learning (ML) is increasingly being utilized to