Idaho Scientific proposes to design and develop, SPUD, an irrefutable tamper logging protocol. During the course of this Phase I effort, Idaho Scientific will implement the core of the logging protocol and develop a set of unit tests designed to evaluate properties of that protocol that uphold its irrefutable claims. During a Phase II effort, Idaho Scientific would propose to encapsulate this protocol in a suite of libraries and utilities. Approved for Public Release 16-MDA-8620 (1 April 16)