Passwords, biometrics, and two-factor authentication
The video Secure Passwords Explained by CommonCraft is a good introduction to this topic. Why passwords have never been weaker - and crackers have never been stronger and How I Became a Password Cracker (ARS Technica) explain the security threats facing passwords.
Two-Step Verification is inconvenient, but more secure (NY Times) and Google's Alternative to the Password (MIT) offer alternatives to passwords.
Biometrics (BBC) are often hailed as a better authentication mechanism, and modern systems can even recognise users by the way they walk (Science Daily).
Problems with biometrics
Contrary to popular belief, biometrics systems can be fooled. For example, by using fake silicone fingers (BBC)
and even plastic fingerprint surgery (BBC). Voice recogition technology can also be fooled: the BBC fooled HSBC's
voice recognition security system for online banking, for example. In 2018 an AI algorithm was revealed that could imitate a person's voice based on only a few samples.
Social and ethical issues
Biometric facial recognition systems can raise privacy issues as they are capable of surveillance without subjects' knowledge or permission - one such example is in the 2001 Super Bowl (The Register). The article You Cannot Encrypt your Face examines this issue in greater detail.
Another potential issue with biometrics is security - ironically there are several major security concerns about using such technology. This Wired article explains the concerns and how they affect stakeholders in various fields.