Here's the actual source from the parliament, https://www.parlament.gv.at/aktuelles/pk/jahr_2025/pk0643 (in German, but should be easy enough to translate).
They haven't said how they want to accomplish it, but some form of spy/malware is probably the only way. There is a lot of opposition to it (like https://www.parlament.gv.at/dokument/XXVIII/I/166/fnameorig_...) but unfortunately the terrorists have already won, so now everyone has neither freedom nor safety.
Can only hope this gets struck down by the constitutional court.