Why Johnnie Still, Still Cannot Encrypt
Here is an excerpt:
In our study of 20 participants, grouped into 10 pairs of participants who attempted to exchange encrypted email, only one pair was able to successfully complete the assigned tasks using Mailvelope. All other participants were unable to complete the assigned task in the one hour allotted to the study. This demonstrates that encrypting email with PGP, as implemented in Mailvelope, is still unusable for the masses.