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The whiskers on tin are naturally occurring I think that is why manufacturers didn't fight it any. It helped their planned obsolescence and gave them the backing they needed to say there was nothing they could do about it. Just my thoughts on it.

https://www.maximintegrated.co...

^^ Included article on tin whiskers. was going to load the one directly from nasa.. but the page wont respond.

https://en.wikipedia.org/wiki/... a codec is a .. COder DECoder.. it can be software.. but it's also hardware.. such as electric pixies into caveman vibrations. below is an example of some of said hardware codecs. Do some research before talking about things you don't know anything about, mmmkay? https://www.maximintegrated.co...

At the voltage-level you get, very roughly half of the noise is quantum and "true" random (which is just Physic-speech for "we have no idea how it works"). Amplify, digitize, pipe into a randomness-pool and you are done. Can be accomplished for $20 or so in parts.

Or you can use a Zener Diode, and some RF amplifiers: https://www.maximintegrated.co...
Spectrum here goes well over 100MHz.

True, but then you are limited to charging at 100 mA (or 500 if you cheat the USB spec), as higher currents require data pins so that the device can detect how much it can draw.
See:
https://www.maximintegrated.co...

You really want a DS32KHZ from Maxim https://www.maximintegrated.co...

The oldest technique is to just burn some data into flash before soldering the chip onto the board. A more hardcore approach is to put a noise-sampling hardware generator to generate the keys on-chip, store keys in volatile memory with power traces on the top layer to defeat micro-probe attacks (you would have to scrape away the power connections get to the memory cells) and clock-limiting circuits to defeat overclocking attacks, etc. Dallas Semiconductor (now Maxim) has been making chips like this since the 90's, so you can put one in your homebrew secure system. https://www.maximintegrated.co...

Hmm. My motherboard (Asrock X99 WS-E) has 3x SGPIO connectors, shouldn't be that hard to find a board that'd convert that into digital or analog I/O lines... yeah, the MAX72408 looks like overkill if you could find it as a basic kit instead of a bare chip.

Here's a decent primer for you.

The basic idea is to spread the signal from a single peak that contains all of the transmitted energy to a very broad series of peaks that each contain a fraction of the transmitted energy. On the receiving end, you recombine the peaks to get enough signal to interpret.

The presence of noise may mask the signal, but it doesn't actually make it stop existing. Transmissions below the noise floor are absolutely possible (I work with them every day). In fact, you do too, since CDMA is a spread spectrum based technology (what do you think "code division" refers to?).

[And to not mislead anyone, there are techniques to detect spread spectrum signals if you don't know the spreading code, but they are not particularly robust and can be designed around.]

Just add a pile of Dallas DS18B20 1-wire sensors.

But if you want to measure other things too, or want a method which doesn't require much effort to apply then the Roomba way is interesting since you can just set it up in the area you want to monitor in a few minutes, leave it for a week and then come back to a well-swept room with a decent amount of data.

The DS1990 is just a serial number chip without encryption. It can be easily copied or imitated.

The DS1961S "Protected EEPROM iButton with SHA-1 Engine" is a much more secure iButton because a secret can be hidden in the iButton that can't be read back, but is used to authenticate the data."

http://www.maximintegrated.com/datasheet/index.mvp/id/3557

You can still buy them:

https://shop.maximintegrated.com/storefront/priceavailable.do?Partnumber=DS1990A&event=PartSearch&menuitem=PriceAndAvailability

USB host controller chipset:

https://shop.maximintegrated.com/storefront/priceavailable.do?Partnumber=MAX3421EEHJ%252B&event=PartSearch&menuitem=PriceAndAvailability

$4.92

That doesn't include DAC hardware.