Can the fingerprint be stolen?

I’m having trouble finding much information about how the fingerprint scanner works. Does it do all the fingerprint recognition/storage right on the fingerprint scanner chip or does it send the images to the operating system?

For example, if I get hacked, can the hackers theoretically install a trojan that sends finger print images somewhere?

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No, the fingerprints are stored on the scanner and the system never sees them. It just sends a message that says success or fail to the system.