Unformatted text preview: •Assume that the challenge C is: “Image pixel values at locations (10,10), (20,20) and (50,50)”
•The sensor computes the response to the challenge using the image it acquires (I): assume this response is: C(I) = “100, 85, 240”
•Assume an attacker is replaying a previously intercepted image (I*),bypassing the sensor image (I) •Server computes C(I*) = “120, 60, 110”
•Since C(I) ≠C(I*), validity check fails
Rathaet al. 2001 (1): ...
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This document was uploaded on 11/03/2011 for the course BIOLOGY BSC1105 at Broward College.
- Fall '10