Security related issues concern almost everyone regarding protecting personal stuff or preventing confidential information of a business to be published. One of the basic concerns of people about security related issues is authentication. Authentication is needed to prove the identity of the person who is accessing the desired resource and whether he/she is permitted or not. Since authentication can be the only key (not necessarily) to access the valuable resources, everyone wants the strongest method available for their protection against the bad guys. One of the most common authentication methods is using passwords and it is highly recommended to use passwords with certain length, use of different characters, etc. Based on observations and different experiences, many people fail to have or keep a strong password that might lead their resources to be unwantedly accessed. Considering password usage on smartphones with tiny keyboards can be annoying for some people as well.
In that point “biometric authentication” method was introduced for daily usage of people on their smart devices such as smartphones. One of the first biometric authentication methods that found its way on smartphones was fingerprint sensors. It is very convenient for everyone because it is unique for every human being, there is no need to memorize it(!) and it is very fast. After some time almost everyone used this method on their smartphones and nowadays it is hard to find a smartphone without fingerprint sensor!
After some time, face recognition systems were added to smart devices to access the desired resources with only showing your face. Although it seems a good authentication method but, it has many problems. Face recognition systems for smartphones are not as accurate as fingerprint sensors so far and there are many cases published that two people that are similar to each other can pass each other’s authentication method. The other problem is that not everyone always looks the same! For example, wearing makeups or even being in a dark place would stop this method to work properly. The most failure of this method so far can be observed during Covid-19 crisis that wearing masks has been almost mandatory in many countries and people wearing masks cannot pass their phones authentication. Therefore, they should use old school typing passwords or somehow risk their health (if they are in a public place) and loose the mask.
Usability of biometric authentication methods has been a game changer but, not all the methods have been successful so far.