ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
During a requirements workshop, the security architect is asked to label several backlog items. Which of the following proposed backlog items is most clearly a non-functional security requirement rather than a functional one?
If a user enters an incorrect password five times, the account shall be locked for 30 minutes.
Users shall be able to generate a one-time passcode to confirm high-risk transactions.
The system shall display the previous successful login time immediately after authentication.
All sensitive data transmitted between components shall be encrypted using only TLS 1.3.
A non-functional security requirement specifies how the system must operate or the quality attributes it must possess, such as encryption standards or performance levels. Requiring that "all sensitive data transmitted between components shall be encrypted using only TLS 1.3" dictates a quality of the system's operation (the cryptographic standard to be used) and does not describe user-visible behavior. The other statements describe specific behaviors the system must perform for or in response to a user (locking an account after failed logins, displaying the last login time, or providing one-time passcodes), making them functional security requirements.
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Why is TLS 1.3 considered a non-functional requirement in the given example?
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What is the difference between functional and non-functional requirements?
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Can functional security requirements also impact the system's non-functional properties?
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Requirements
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