Rare kaon decay measurements with NA48/NA62 minumum bias data

The NA62 and NA48/2 experiments at CERN collected a large sample of charged kaon decays with a low intensity beam and minimum bias trigger conditions in 2004 (NA48/2) and 2007 (NA62). This allowed measurements of a number of rare decays that are difficult to address in conventional high intensity experiments with highly selective trigger conditions. In particular, large samples of K±→π±γγ and K±→e±(−−)νγ decays have been collected, allowing precision tests of the Chiral Perturbation Theory. The status and first results of these analyses are presented.