A data breach that posted 100 to 200 names, email addresses, and encrypted passwords online was found in the Belgian Covid-19 Alert! app, one of seven candidates for adoption by the Dutch government. The app identifies phones that have been close to each other via Bluetooth signals and can send them a message when one owner tests positive. The developers said the data leaked from a database relating to another project when the source code was hurriedly placed online for government scrutiny.…