Re: i-dropper

[nobody@xxxxxxxxxxxx (Dave Houston)]

Actually, the range is very limited - 1m or so max. That makes it nearly
imposasible to eavesdrop on it to steal the code. RF is inherently less
secure.

"Alan Vogel" <avogel2@xxxxxxxxxxxxx> wrote:

>Ah, but then you would have to be almost on top of the sensor in order to
>communicate.
>
>At that point it may be better to just touch the key to a mating pair of
>contacts.  Or if ESD is an issue, use a wireless RFID like the one mentioned
>in the link below.
>
>But if you're indoors, I would think that the LED system should work most of
>the time.
>
>"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>news:44312be3.858943843@xxxxxxxxxxxxxxxx
>> It should be easy to prevent sunlight from hitting the LED. You could make
>> it the proverbial "light at the end of a tunnel". ;)
>>
>> Here's another link that shows it being used for a touchpad like input
>> device.
>>
>>     http://mrl.nyu.edu/%7Ejhan/ledtouch/index.html
>>
>> "Alan Vogel" <avogel2@xxxxxxxxxxxxx> wrote:
>>
>>>A nice idea, but if this technique is used for keyless entry outdoors then
>>>I
>>>would think that sunlight could saturate the LED.
>>>
>>>Here's another clever idea from MERL, based on an idea from Microchip's
>>>old
>>>"Designing For Dollars" competition.
>>>
>>>http://www.merl.com/papers/docs/TR2002-21.pdf
>>>
>>>
>>>"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>>>news:442eaff2.696142765@xxxxxxxxxxxxxxxx
>>>> Here's a really neat, super secure and super cheap way to implement
>>>> things
>>>> like keyless entry.
>>>>
>>>>     http://www.merl.com/reports/docs/TR2003-35.pdf
>>>
>>
>