ITU-T X.1081 PDF

This Recommendation defines a telebiometric multimodal model that provides a common framework for the specification of four interconnected security issues: privacy, authentication, safety and security with, for example "acceptable biometric authentication schema".

This telebiometric multimodal model covers all the possibilities for safe and secure multimodal man-machine interactions, and is derived in part from [ISO/IEC 80000]. The cognitive, perceptual and behavioural modalities of a human being are also relevant in the field of telecommunication, and are likely to be used by a biometric sensor or effector in the future, for authentication purposes. These are also covered by this telebiometric multimodal model.

This Recommendation includes specification of the personal privacy sphere, categorization of modalities of interaction across that sphere, base and derived units for measuring and specifying (in a quantitative manner) such interactions, and a scale hierarchy for relative propinquity. It also includes some discussion of the differences between particle and wave interactions.