Separation of Duties


Separation of duties must be designed into a system. Software components can be designed to enforce separation of duties when they require multiple conditions to be met before a task is considered complete. These multiple conditions can then be managed separately to enforce the checks and balances required by the system. In designing the system, designers also impact the method of operation of the system.

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As with all other design choices, the details are recorded as part of the threat model. This acts as the communication method between all members of the development effort. Designing in operational elements such as separation of duties still requires additional work to happen through the development process, and the threat model can communicate the expectations of later development activities in this regard.


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