Patent Document ID: 20140180980
Application ID: 14234747
Patent Flag: 0

Claim One:
1. A computer implemented information identification method for detecting an attack carried out using irregular data against a classifier that is configured by means of supervised machine learning, the method comprising the steps of: preparing a plurality of pieces of training data each including feature data, a label, and time; configuring the classifier by using the plurality of pieces of training data; configuring a sub-classifier by using the plurality of pieces of training data while classifying data in classes obtained through classification by the classifier, into subclasses; preparing a plurality of pieces of test data each including feature data, a label, and time; classifying the plurality of pieces of test data by using the classifier; classifying the plurality of pieces of test data that have been classified, into subclasses by using the sub-classifier; calculating statistical data representing a relative frequency of the plurality of pieces of test data with respect to the plurality of pieces of training data, the statistical data being calculated for each identical set of the subclasses in a time window having a predetermined width for the time; and warning of a possibility of occurrence of the attack carried out using the irregular data, in response to a value of the statistical data exceeding a predetermined threshold.