** Shares of archTIS AR9.AX gain as much as 24.6% to
A$0.086, best day since Jan 31 if gains hold
** The data security firm says signed an agreement with the
Australian Department of Defence
** Agreement to conduct a proof of concept to assist with
modernising their workplace environment
** AR9 hits highest level since June 21
** Says contact is valued at A$4.06 mln ($2.68 mln)
** Stock has fallen 37.3% this year as of last close
($1 = 1.5142 Australian dollars)
(Reporting by Jaskiran Singh in Bengaluru)
((Jaskiran.Singh@thomsonreuters.com;))