Biometric Authentication with data transmission tangled.

A biometric authentication system for verifying detected biometric characteristic data the registered biometric characteristic against data, including biometric authentication system: an IC card (5); biometric authentication device comprising: an image capture device (1) for capturing an image of a part of a living body and transmission of the image; a reader / writer (9) of IC cards for reading and writing the IC card (5) storing the first biometric characteristic data and second biometric characteristic data of a user; and a control unit (38) for performing primary verification of said captured image with said first biometric characteristic data, creating final verification data and transmitting to said IC card (5) said final verification data; characterized in that the device capturing images (1) is functional to entangle the captured image and to transmit the tangled to the control unit captured image (38), the control unit (38) is operative to disentangle tangled captured image received from the capture device images (1), for receiving those first biometric characteristic data as first biometric characteristic data entangled from said IC card (5), to untangle said first biometric characteristic data tangled, to perform primary verification and to entangle said data final check for transmission to the IC card (5), and wherein said IC card (5) is operative to disentangle the data of final verification tangled, and to perform secondary verification of said data final verification disentangled with said second biometric characteristic data Store up os, and wherein said IC card (5) stores said first biometric characteristic data as tangled, which are comparatively coarse characteristic biometric data, and stores said second characteristic biometric data as decrypted data, which are comparatively fine characteristic biometric data of the user ; and wherein said device capturing images (1) of the biometric authentication device comprises a unit for capturing an image of blood vessels of a body part of said user, and wherein said first biometric characteristic data are comparatively coarse characteristic data of said blood vessel image, and said second biometric characteristic data is comparatively fine characteristic data of said blood vessel image.