When I learned basic chemistry "room temperature" specifically meant 20 degrees Celcius. It is a fixed value.
From http://en.wikipedia.org/wiki/Room_temperature:
"For scientific calculations, room temperature is usually taken to be 20 or 25 degrees Celsius, (293 or 298 kelvin (K), 68 or 77 degrees Fahrenheit)."
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Take a look at your numeric keypad for a possible suggestion:
4 5 6
1 2 3
....maybe you could use those for the 6 directions? 5 is up, 2 is down the other 4 are "diagonals". Not so weird IMO.
Not if the data is encrypted with a private key and the public key stored with it (on the card) AND made publicly available for checking authenticity.
On the other hand in 100 years it may take just a few nanoseconds to break today's encryption!
When I learned basic chemistry "room temperature" specifically meant 20 degrees Celcius. It is a fixed value. From http://en.wikipedia.org/wiki/Room_temperature: "For scientific calculations, room temperature is usually taken to be 20 or 25 degrees Celsius, (293 or 298 kelvin (K), 68 or 77 degrees Fahrenheit)."