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FIPS 140-2 Level 4 encryption is primarily concerned with environment protection. This level of encryption places a significant emphasis on ensuring that the cryptographic module is secure from environmental attacks, such as physical tampering or manipulation. It requires that the device is designed to resist both physical and logical attacks when in use, including implementing measures to combat side-channel attacks and ensuring that the environment of the cryptographic module does not compromise its integrity.

The security requirements at this level are stringent, and they demand that the cryptographic module includes various protective measures, like physical security mechanisms, and that it is thoroughly tested and validated in various environmental conditions to ensure its resilience against various forms of attack.

While the other areas like key management, data integrity, and user authentication are important components of cryptographic systems, they do not capture the central focus that FIPS 140-2 Level 4 puts on the protection of the environment in which the encryption takes place. This allows for a secure operation of the cryptographic module under adverse conditions, making it suitable for the most sensitive national security applications.