What is an example of a passive security measure in electronic access control?

In the context of electronic access control systems, a passive security measure is one that does not require active involvement or user interaction to maintain its effectiveness. The use of encryption is a prime example of this type of measure. It serves to protect data by transforming it into a secure format that can only be accessed by those with the appropriate decryption key. This mechanism operates silently in the background, safeguarding sensitive information without requiring ongoing action from users or administrators.

Passive security measures, such as encryption, act as a foundation for securing access control systems by ensuring that data is protected even when it is stored or transmitted, reducing the risk of unauthorized access. Encryption effectively mitigates potential threats by making it significantly more difficult for malicious actors to read or misuse the data, thereby enhancing overall security without necessitating continuous oversight or intervention.