Functional security testing verifies that specific security controls operate as designed. Validating account lockout after consecutive failed logins directly tests an authentication control's logic, so it is functional security testing. Measuring response-time impacts of TLS, fuzzing session management to look for crashes, and stressing the database for load tolerance evaluate performance, robustness, or reliability under adverse conditions; these are nonfunctional security tests, not functional ones.
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Testing
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