Keyboards Followup / Paranoia

[Nathan England]

I appreciate all of your thoughts who responded to my question about 
keyboards. Thank you!

While I am positive I am on several watch lists already, I really don't 
believe anyone would particularly care about my usernames and passwords 
to online systems I use. But the thought occurred to me, and I like to 
entertain my tinfoil hat once in a while, so what if someone were to 
intercept the keyboard I purchase and place a keylogger in the firmware...

Is it possible to detect a keylogger built in the firmware of a 
keyboard? Do all keyboards have firmware? What if the keyboard does not 
have macros or extra keys or special keys (beyond blank keycaps)? Could 
the USB cable itself be a keylogger?

How would you go about detecting that?

Seriously, I ask this tongue in cheek, but really am curious about the 
answer! Thanks!

-- 
Regards,

Nathan England

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NME Consulting Services http://www.nmecs.com
Nathan England (nathan at nmecs.com)
Systems Administration / Web Application Development
Information Security Consulting
(480) 559.9681