Password Protection

I am interested in creating a database for athlete data collection. I need to have this form password protected and when the athlete logs in using their password, the database must recognize several factors without the athlete having to provide this info each time. These variables include the following:

- the athletes name
- the team the athlete is on (basketball, baseball, etc...)
- if the athlete is male or female

In other words, I don't want the athletes to have to enter the above data each time....when they enter their username/password, the database will recognize who it is, enabling me to separate data per individual athlete.

So, when I export or view the data, i will be able to sort by team, name, sex or the other variables I choose to include in the data collection progress.

Any suggestions?