Which security control allows access to a website for an individual or user group?

• A. Whitelisting
• B. Blacklisting
• C. Cryptography
• D. Transposition Cipher

Answer: (A)

Allowlisting controls access by explicitly listing who is allowed. A website can implement an allowlist to permit access only for specified individuals or groups, denying everyone else. When a user attempts to connect, the system checks the list and grants access if they’re on it. This approach provides precise control over who can reach the site, which is ideal when access must be limited to particular people or roles, such as employees or partner organizations. In contrast, blacklisting blocks known bad actors but doesn’t define who is allowed in general; cryptography and the transposition cipher are about protecting data through encryption rather than gatekeeping access to a site.