On Tue, Dec 11, 2007 at 02:01:03PM -0500, j...@tla.org wrote:
How many bits (not just data, also preamble/postamble, sync bits, etc.)
is the keyboard sending for each keystroke anyway?
FWIW, it is likely sending keyboard scan codes:
http://en.wikipedia.org/wiki/Scancode
It doesn't send the
James A. Donald [EMAIL PROTECTED] writes:
At every block boundary, keyboard transmits a special signal in the clear
that signifies block boundary. Any time that no key has been pressed for a
while, then when a key is finally pressed, keyboard transmits a bunch of no-
ops sufficient to ensure
On 12/10/07, Steven M. Bellovin [EMAIL PROTECTED] wrote:
Believe it or not, I thought of CFB...
What about PCFB to get around the block issue? I remember freenet
using it that way...
--
Taral [EMAIL PROTECTED]
Please let me know if there's any further trouble I can give you.
-- Unknown
Steven M. Bellovin wrote:
Believe it or not, I thought of CFB...
Sending keep-alives will do nasties to battery
lifetime, I suspect; most of the time, you're not
typing. As for CFB -- with a 64-bit block cipher (you
want them to use DES? they're not going to think of
anything different),
| Exactly what makes this problem so difficult eludes me, although one
| suspects that the savage profit margins on consumables like
| keyboards and mice might have something to do with it.
|
| It's moderately complex if you're trying to conserve bandwidth (which
| translates to power) and
Steven M. Bellovin wrote:
It's moderately complex if you're trying to conserve bandwidth (which
translates to power) and preserve a datagram model. The latter
constraint generally rules out stream ciphers; the former rules out
things like encrypting the keystroke plus seven random bytes with a
On Tue, 11 Dec 2007 13:49:19 +1000
James A. Donald [EMAIL PROTECTED] wrote:
Steven M. Bellovin wrote:
It's moderately complex if you're trying to conserve bandwidth
(which translates to power) and preserve a datagram model. The
latter constraint generally rules out stream ciphers; the
Microsoft wireless keyboard communications
http://www.dreamlab.net/download/articles/Press%20Release%20Dreamlab%20T
echnologies%20Wireless%20Keyboard.pdf
Computerworld coverage at
http://www.computerworld.com/action/article.do?command=viewArticleBasic;
articleId=9051480
The main protection against
