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Some pointing devices (e.g. gaming mice) can be set to send mouse-movement events at an extremely high sample rate like 1kHz. This apparently translates into Windows genuinely sending WM_MOUSEMOVE messages at that rate. So if you're using one of those mice, then PuTTYgen's mouse-based entropy collection system will fill its buffer almost immediately, and give you no perceptible time to actually wave the mouse around. I think that in that situation, there's also likely to be a strong correlation between the contents of successive movement events, because human-controlled mouse movements aren't fractals - the more you zoom in on a little piece of one, the more it starts to look more and more like something moving in a straight line at constant speed, because the deviations from that happen on a larger time scale than you're seeing. So this commit adds a rate limit, not on the _collection_ of the data (we'll still take all the bits we can get, thanks!), but on the rate at which we increment the _counter_ for how much entropy we think we've collected so far. That way, the user still has to spend time wiggling the mouse back and forth in a way that varies with muscle motions and introduces randomness.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.