Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for capacitive through-body communication. In one aspect, a method includes capturing, from capacitive through-body communication with an on-body device worn by an individual, a biometric template comprising identification data associated with the individual, comparing the captured identification data of the captured biometric template with reference identification data of a stored biometric template associated with the individual, determining that the captured identification data matches the reference identification data of the stored biometric template; and authenticating identification of the individual.