Why don't security professionals don't talk about detecting hardware keyloggers

The other day I stumbled on a 350 lines Rust code on GitHub that detects hardware keyloggers by finding discrepancies in HID attributes. The author of the repo mentioned that his project was solely based on some research papers as he didn't have access to any HKL device. So, I mailed him asking if he could share the research papers he referred to. He sent me a link to one research paper from 2010. The author of that paper mentioned …

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