ATECC508A I2C Protection

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I am planning on improving our IoT device designs to include a higher level of security, including the ATECC508A chip.  

One concern, however, is whether the I2C communications between the chip and the microprocessor is also protected, and if so how?  

How can the device protect against a hardware intrusion to the I2C bus?  

Is there a document addressing this?