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System security in the context of software testing is fundamentally about the protection of data from unauthorized access. This means ensuring that sensitive information is safeguarded against breaches, ensuring that only authorized users can access, modify, or delete data. Software testing in this aspect often involves implementing various security testing techniques, such as vulnerability assessments, penetration testing, and security audits, to identify potential weaknesses in the system's defenses.

By focusing on this aspect, organizations can ensure that their software not only functions correctly but also maintains the confidentiality, integrity, and availability of data, thereby protecting against risks such as data breaches and cyberattacks.

The other definitions focus on different facets of software quality and performance, which do not directly relate to the core principles of system security.