Browser crypto has come a long way. With libraries like libsodium and proper implementation I think it’s drastically better than at the time of those articles (2013 and 2011).
Source: we also write encryption libraries and have a free implementation of our browser sdk at https://share.labs.tozny.com
Source: we also write encryption libraries and have a free implementation of our browser sdk at https://share.labs.tozny.com