Warning, /plasma/ksshaskpass/README is written in an unsupported language. File is not indexed.

 Ksshaskpass is a front-end for ssh-add which stores the password of the
 sh key in KWallet.
 Ksshaskpass is not meant to be executed directly, you need to tell
 ssh-add about it. ssh-add will then call it if it is not associated
 to a terminal.
 From the ssh-add manpage:
 /----------------
 |  DISPLAY and SSH_ASKPASS
 |    If ssh-add needs a passphrase, it will read the passphrase from the
 |     current terminal if it was run from a terminal.  If ssh-add does not
 |     have a terminal associated with it but DISPLAY and SSH_ASKPASS are
 |     set, it will execute the program specified by SSH_ASKPASS and open
 |     an X11 window to read the passphrase. This is particularly useful
 |     when calling ssh-add from a .xsession or related script.  (Note that
 |     on some machines it may be necessary to redirect the input from
 |     /dev/null to make this work.)
 \----------------
 
 This means you need to make sure to set the SSH_ASKPASS environment variable
 to the path of ksshaskpass and then call ssh-add from your autostart scripts.
 
 To add it to the KDE autostart sequence you could for example create an
 executable script with the following content in ~/.kde/Autostart/ (or maybe
 /.kde4/Autostart/, depending on the distribution).
 
 /----------------
 |#!/bin/sh
 |
 |SSH_ASKPASS=ksshaskpass ssh-add < /dev/null
 \----------------