Which operational security principle decreases the likelihood that an external adversary will obtain critical system information by allowing access only to personnel whose duties require it?
Obfuscation
Redundancy
Need-to-know (compartmentalization)
High availability
The need-to-know principle limits disclosure of sensitive details to the smallest possible group whose job functions require that knowledge. By shrinking the insider pool, it minimizes the number of potential targets an adversary can exploit, thereby protecting mission-critical information. High availability, obfuscation, and redundancy do not inherently restrict access and therefore do not serve this counterintelligence purpose.
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