System for the acquisition and processing of information associated with a dynamic handwritten signature, including an electronic pen with which the signature is made and a capacitive touchscreen mobile device on which the signature is made, in order to be sent to an authentication server to validate the signature authenticity, the electronic pen comprising a housing which allows the transmission of static electricity to the pen tip, and being equipped with two groups of inertial acceleration sensors (MEMSA and MEMSB), the first (MEMSA) being located closer to the tip of the electronic pen and the other (MEMSB) being located at a distance d of at least 30 mm from the first group, sufficient to emphasize the spatial kinetic information of the signature, which captures the kinetic information (ax, ay, bx, by), and an acquisition microcontroller (μC) which takes the information from the two groups of sensors and transmits it as it is acquired to a power and communication module, said capacitive touchscreen mobile device comprising means for capturing data sets (x, y, t), where (x, y) represents the absolute graphical coordinates, expressed in pixels, of the pen tip position in contact with the capacitive touchscreen during the signing process, at time t, expressed in milliseconds, the system being configured to process, synchronize and store on said capacitive touchscreen mobile device the information captured by the electronic pen and the capacitive touchscreen mobile device by: a) establishing the time of start of the dynamic handwritten signature, at which time a command is sent to the electronic pen, after which the acquisition microcontroller starts sending via the power and communication module the kinetic data (ax, ay, bx, by) captured from the two groups of MEMS inertial acceleration sensors to the capacitive touchscreen mobile device; b) taking after the start time of the kinetic information (ax, ay, bx, by) captured by the electronic pen and the graphical and temporal information (x, y, t) from the capacitive touchscreen mobile device, by said capacitive touchscreen mobile device; c) establishing the time of stop of the mentioned dynamic handwritten signature, at which time a command is sent to the electronic pen, after which the acquisition microcontroller ceases to send the kinetic information to the capacitive touchscreen mobile device; d) associating and synchronizing the kinetic information from the electronic pen with the graphical information from the capacitive touchscreen mobile device. a) establishing the time of start of the dynamic handwritten signature, at which time a command is sent to the electronic pen, after which the acquisition microcontroller starts sending via the power and communication module the kinetic data (ax, ay, bx, by) captured from the two groups of MEMS inertial acceleration sensors to the capacitive touchscreen mobile device; b) taking after the start time of the kinetic information (ax, ay, bx, by) captured by the electronic pen and the graphical and temporal information (x, y, t) from the capacitive touchscreen mobile device, by said capacitive touchscreen mobile device; c) establishing the time of stop of the mentioned dynamic handwritten signature, at which time a command is sent to the electronic pen, after which the acquisition microcontroller ceases to send the kinetic information to the capacitive touchscreen mobile device; d) associating and synchronizing the kinetic information from the electronic pen with the graphical information from the capacitive touchscreen mobile device.