Abstract: The present invention describes a method and system for protecting the integrity and authorship of a piece of registration information of the user, applicable in voter information registration, by means of biometric techniques. To that end, after a first stage of entering a piece of registration information, a second stage of protecting the integrity of the registration information is implemented. In this second stage, an item of integrity proof of said information is generated and said item of integrity proof is displayed to the user who wishes to protect it. In a third stage of generating an item of non-repudiation proof of the registration information, an item of biometric proof of the user which contains the item of integrity proof displayed is obtained, an item of non-repudiation proof is constructed from said item of biometric proof, and finally the item of non-repudiation proof is stored.