An authentication system has wearable biometric sensing devices 105, 106 and a wearable computing means 402. The sensing devices are adapted to measure a user's Electrocardiogram (ECG) and at least one of Electrodermal Activity (EDA) and an electromyograph (EMG) signal, communicate with the wearable computing means, and be incorporated in or on clothing (see figures 1-3) in a manner in contact with skin. The wearable computing means is adapted to determine user authentication and physiological information based on measurements from one or more of the sensing devices. Photoplethysmogram (PPG) and /or Doppler ultrasound devices may also be used as biometric sensors. The computing means may have motion altitude or temperature sensors. Microprocessor 226 may process data received from the biometric sensors and transmit the processed data to remote terminal 200.
