Description:

This is an X11-based passphrase dialog for use with OpenSSH.
These dialogs are intended to be called from the ssh-add program and
not invoked directly.

The features of x11-ssh-askpass are as follows:
+ Configurable via the standard X resource mechanism
(/usr/lib/X11/app-defaults, ~/.Xdefaults, xrdb, etc.).
+ Requires only stock X11 libraries (libXt, libX11, libSM, libICE).
+ Can be configured to grab the keyboard and/or pointer (grabs the
keyboard by default, not the pointer).

The user interface is somewhat different than most password/passphrase
dialogs and more similar to the X11-based passphrase dialog that
accompanies the regular SSH distribution. Instead of a text field that
fills with asterisks or some other character as the user enters the
passphrase, a series of LED-like areas light up one-by-one with each
passphrase character entered, beginning from the lefthand edge of the
dialog. When they reach the righthand edge, they go dark one-by-one
again, and so on. This gives the user feedback that passphrase
characters have been entered, but does not provide onlookers with a
clue as to the length of the passphrase.