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A critical aspect of access control systems is the verification of individual identities before granting access. This process is essential to ensure that only authorized personnel can enter secure areas or access sensitive information. By effectively verifying identities, organizations can prevent unauthorized access, which is vital for maintaining security and protecting assets. This usually involves checking credentials such as biometric data, identification cards, passwords, or security tokens.

While factors like cost-effectiveness of installation, integration with social media, and restricting information flow to security personnel may also be relevant to broader security planning, they do not stand out as essential components of access control systems. The primary function of an access control system revolves around ensuring proper identity verification, making it the cornerstone of security within any facility or organization.