Active-Session Defense (ASD): Foundational Technical Framework v1.0

Active‑Session Defense (ASD) is a new security architecture that eliminates the long‑standing post‑authentication vulnerability window in mobile devices by introducing continuous possession assurance and automated hostile‑possession response. Traditional mobile security models authenticate only at unlock and then extend unconditional trust for the remainder of the session. As stated in the foundational ASD framework, “Current systems establish a single binary trust boundary at the moment of device access… Once this boundary is crossed, the device enters a state of implicit, unconditional trust in the physical possessor.”ASD defines the first complete, real‑time possession‑security framework. It introduces two core subsystems: Continuous Possession Assurance (CPA), which maintains a real‑time Possession Confidence Score using behavioral biometrics, motion signatures, grip signatures, and contextual signal fusion; and Hostile‑Possession Response (HPR), which executes graduated, covert defensive actions when unauthorized possession is detected. As described in the technical standard, “ASD maintains continuous possession assurance from session initiation through session termination… providing uninterrupted verification of authorized physical possession and automated defensive response upon detection of unauthorized possession transfer.”This Zenodo release contains two documents:(1) ASD Technical Standard v1.0 (Foundational 60‑Page Framework) — the complete system architecture, terminology, threat model, signal‑collection methodology, scoring algorithms, state machine, and defensive response protocols. This document establishes ASD as a new security domain and provides the full technical basis for implementation, research, and patent protection.(2) ASD DARPA Addendum v1.0 — a federal‑grade expansion that aligns ASD with DARPA, DIU, AFRL, and DoD modernization priorities. The addendum introduces Mission Edge operational modes, Zero Trust continuous authentication alignment, MicroCloud survivability, Decision Dominance integration, tactical‑edge deployment requirements, hybrid‑cloud compatibility, and DevSecOps integration pathways.Together, these documents define the first unified technical standard for continuous possession assurance and hostile‑possession response in mobile devices. They provide a complete reference for researchers, security engineers, federal program evaluators, and standards bodies assessing next‑generation mobile security architectures.