- A method for verifying the identity of a user of an online service, comprising: when a user is connected to an online service from a user terminal comprising a webcam and a microphone, establishing a connection between the user terminal and an biometric data collecting module; downloading from the biometric data collecting module at least one application for taking photos with the webcam of the user terminal; the method being characterized in that it further comprises: downloading from the biometric data collecting module at least one application for capturing audio with the microphone of the user terminal; while a session with the online service is active: taking a photo with the webcam of the user terminal, said taking a photo being controlled by the application for taking photos; sending the photo taken and associated metadata to a management module, said metadata being at least a user ID of the user using the user terminal and the time of capture of said photo; automatically extracting one set of features per each face which appears in said photo; comparing said set or sets of features extracted from said photo with a biometrical model of a reference photo of the user; repeating the former steps at periodic or non-periodic time intervals, thus continuously verifying the identity of the user connected to the online service through the user terminal; every time sound is detected by the microphone of the user terminal, recording the sound as an audio clip, sending it to the management module, checking whether said sound is voice or not, and if it is voice: extracting therefrom voice features and comparing them with a reference voice model obtained from a reference audio file of the user, if the result of any of the two comparisons does not unequivocally match the person in the photo and/or audio clip with the user to which said user ID belongs, either informing the provider of the online service of this or sending the photo and/or audio clip to a manual recognition unit for manual validation. when a user is connected to an online service from a user terminal comprising a webcam and a microphone, establishing a connection between the user terminal and an biometric data collecting module; downloading from the biometric data collecting module at least one application for taking photos with the webcam of the user terminal; downloading from the biometric data collecting module at least one application for capturing audio with the microphone of the user terminal; while a session with the online service is active: taking a photo with the webcam of the user terminal, said taking a photo being controlled by the application for taking photos; sending the photo taken and associated metadata to a management module, said metadata being at least a user ID of the user using the user terminal and the time of capture of said photo; automatically extracting one set of features per each face which appears in said photo; comparing said set or sets of features extracted from said photo with a biometrical model of a reference photo of the user; repeating the former steps at periodic or non-periodic time intervals, thus continuously verifying the identity of the user connected to the online service through the user terminal; every time sound is detected by the microphone of the user terminal, recording the sound as an audio clip, sending it to the management module, checking whether said sound is voice or not, and if it is voice: extracting therefrom voice features and comparing them with a reference voice model obtained from a reference audio file of the user, if the result of any of the two comparisons does not unequivocally match the person in the photo and/or audio clip with the user to which said user ID belongs, either informing the provider of the online service of this or sending the photo and/or audio clip to a manual recognition unit for manual validation. taking a photo with the webcam of the user terminal, said taking a photo being controlled by the application for taking photos; sending the photo taken and associated metadata to a management module, said metadata being at least a user ID of the user using the user terminal and the time of capture of said photo; automatically extracting one set of features per each face which appears in said photo; comparing said set or sets of features extracted from said photo with a biometrical model of a reference photo of the user; repeating the former steps at periodic or non-periodic time intervals, thus continuously verifying the identity of the user connected to the online service through the user terminal; every time sound is detected by the microphone of the user terminal, recording the sound as an audio clip, sending it to the management module, checking whether said sound is voice or not, and if it is voice: extracting therefrom voice features and comparing them with a reference voice model obtained from a reference audio file of the user, if the result of any of the two comparisons does not unequivocally match the person in the photo and/or audio clip with the user to which said user ID belongs, either informing the provider of the online service of this or sending the photo and/or audio clip to a manual recognition unit for manual validation.