Examples disclosed herein relate, among other things, to a monitoring system. The monitoring system may include a report analyzer configured to receive a report from one of a plurality of devices and determine whether the report includes at least one masked value. If the report includes at least one masked value, the report analyzer may be configured to determine, based on a plurality of reports associated with the masked value, whether an unmasking condition is satisfied, and if the unmasking condition is satisfied, to mark the masked value for unmasking.