パスワードの変更は安全とは限らない？

下記の記事が出ている。

　Forcing users to change their passwords may do more harm than good
　ZDNet: March 4, 2016
　http://www.zdnet.com/article/forcing-users-to-change-their-passwords-may-do-more-harm-than-good/

  FTC says you SHOULDN’T change your password: Advisors claim mandatory monthly changes cause us to come up with insecure codes
　Daily Mail: 4 March, 2016
　http://www.dailymail.co.uk/sciencetech/article-3476977/FTC-says-SHOULDN-T-change-password-Advisors-claim-mandatory-monthly-changes-cause-come-insecure-codes.html

　Time to rethink mandatory password changes
　FTC: March 2, 2016
　https://www.ftc.gov/news-events/blogs/techftc/2016/03/time-rethink-mandatory-password-changes