Day: January 13, 2017

Backdoor: A Technical Definition

Original Date: April, 2016

A clear technical definition of the term backdoor has never reached wide consensus in the computing community. In this paper, I present a three-prong test to determine if a mechanism is a backdoor: “intent”, “consent”, and “access”; all three tests must be satisfied in order for a mechanism to meet the definition of a backdoor. This three-prong test may be applied to software, firmware, and even hardware mechanisms in any computing environment that establish a security boundary, either explicitly or implicitly. These tests, as I will explain, take more complex issues such as disclosure and authorization into account.

The technical definition I present is rigid enough to identify the taxonomy that backdoors share in common, but is also flexible enough to allow for valid arguments and discussion.

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