Online taxpayer identity recognition method based on variable-length system calling sequence birthmarks

The invention provides an online taxpayer identity recognition method based on variable-length system calling sequence birthmarks. The online taxpayer identity recognition method is divided into two stages, namely the stage of establishing an offline normal birthmark library based on normal historical tax behaviors of a user, and the stage of recognizing the user identity in real time for the real-time tax scene of the user; the method is used for realizing real-time online recognition on the behaviors and the identities of the taxpayers by extracting the system calling sequence characteristics that the software system shows in the operation processes of different taxpayers, and therefore, the recognition of the identifies of the taxpayers can be realized in case that the identity authentication information of the taxpayers is stolen.