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Procedure: Analyze the way a person walks. Security Considerations: Can be captured at a distance without user cooperation but can be affected by injury or imitation.

Procedure: Measure and analyze the shape and size of the hand and fingers. Security Considerations: Less unique than fingerprints or iris patterns; hardware can be bulky.

Procedure: DNA profiling to identify genetic markers. Security Considerations: Highly accurate and unique, but the collection can be invasive and processing times can be long.

Procedure: Capture and analyze the pattern of blood vessels under the skin. Security Considerations: Difficult to spoof and not subject to changes like aging, but requires specialized hardware.

Procedure: Analyze vocal characteristics and patterns. Security Considerations: Can be mimicked or recorded; background noise can affect accuracy.

Procedure: Scan the pattern of blood vessels in the retina. Security Considerations: Highly accurate but requires close contact with the scanner, which can be uncomfortable for users.

Procedure: Capture and analyze the unique patterns of a person's iris. Security Considerations: Requires high-quality images and is difficult to spoof; consider environmental factors affecting capture.

Procedure: Monitor the timing and rhythm of typing on a keyboard. Security Considerations: Relatively easy to implement but can vary with physical or emotional state of the user.

Procedure: Scan and analyze the unique patterns of ridges and valleys on a finger. Security Considerations: Vulnerable to replication and spoofing; should implement liveness detection.