A system for the acquisition of biometric information, comprising a remote device and a communication terminal which are suitable for communicating with one another via a communication network, the terminal comprising: - at least one sensor for the acquisition of biometric images; - at least one lighting device for the acquisition of the biometric images; - at least one first processor programmed to generate a control instruction based on a pre-established code known at the terminal and at the remote device and on an item of encoded information other than a control instruction, said item of encoded information being contained in a message (M1, M2) exchanged between the communication terminal and the remote device, this control instruction being suitable for being executed while a series of images is acquired by the acquisition sensor and for inducing, in images of the series of images acquired by the acquisition sensor, characteristics representative of the item of encoded information contained in said message, the processor being programmed to control the acquisition of a series of images by the acquisition sensor while said control instruction is executed and to transmit at least part of the images of said series of images to said remote device; and said remote device comprising a second processor programmed to detect attempted fraud, by verifying if the transmitted images from the series of images comprise characteristics representative of said item of encoded information contained in said message exchanged between the communication terminal and the remote device. - at least one sensor for the acquisition of biometric images; - at least one lighting device for the acquisition of the biometric images; - at least one first processor programmed to generate a control instruction based on a pre-established code known at the terminal and at the remote device and on an item of encoded information other than a control instruction, said item of encoded information being contained in a message (M1, M2) exchanged between the communication terminal and the remote device, this control instruction being suitable for being executed while a series of images is acquired by the acquisition sensor and for inducing, in images of the series of images acquired by the acquisition sensor, characteristics representative of the item of encoded information contained in said message, the processor being programmed to control the acquisition of a series of images by the acquisition sensor while said control instruction is executed and to transmit at least part of the images of said series of images to said remote device; and said remote device comprising a second processor programmed to detect attempted fraud, by verifying if the transmitted images from the series of images comprise characteristics representative of said item of encoded information contained in said message exchanged between the communication terminal and the remote device. programmed to generate a control instruction based on a pre-established code known at the terminal and at the remote device and on an item of encoded information other than a control instruction, said item of encoded information being contained in a message (M1, M2) exchanged between the communication terminal and the remote device, this control instruction being suitable for being executed while a series of images is acquired by the acquisition sensor and for inducing, in images of the series of images acquired by the acquisition sensor, characteristics representative of the item of encoded information contained in said message, the processor being programmed to control the acquisition of a series of images by the acquisition sensor while said control instruction is executed and to transmit at least part of the images of said series of images to said remote device; and said remote device comprising a second processor programmed to detect attempted fraud, by verifying if the transmitted images from the series of images comprise characteristics representative of said item of encoded information contained in said message exchanged between the communication terminal and the remote device.