Code.org has a fantastic 50 minute lesson on passwords titled Perfect Passwords. The lesson plan includes everything a teacher needs to introduce their students about passwords and the importance of them being secure. The lesson can teach students how to create safe and secure password with techniques and rules that they can follow for the rest of their lives. It also includes an optional activity where students can test their own passwords with a range of statements. this gives students a fantastic insight into how their own passwords may not be safe and what they can do to improve them. The knowledge they acquire can be passed on to their family to help them feel more secure in a variety of ways.