The documentation implies that ReadKey does not work on Windows, but it does. However, in the spirit of TMTOWTDI:
use Win32::Console;
$CONSOLE = new Win32::Console (STD_INPUT_HANDLE);
print "Enter password: "; # prompt
$old_mode = $CONSOLE->Mode(); # get current mode
$new_mode = $old_mode ^ ENABLE_ECHO_INPUT; # unset echo
$CONSOLE->Mode($new_mode);
$new_mode = undef; # loose the new_mode
chomp($passwd=<STDIN>); # read password
$CONSOLE->Mode($old_mode); # reset console
Incidently, notice that chomp is safer than chop.
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