GSMK CryptoPhone G10, User Manual

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ver ify in g th em w ith yo ur par tn er, yo u m ake su re th at
you ar e i nd eed co mm un ica tin g u sin g t he sam e k ey.
Ple ase p ay att en tio n to th e v oic e o f y ou r p art ner w hen
he rea ds his th ree le tte rs. T o b e c om ple tel y o n th e s afe
sid e a gai nst ve ry sop his tic ate d v oic e i mp ers on ati on
dur in g th e k ey ver ific atio n, y ou cou ld per iod ica lly re ver -
ify th e le tte r c ode w ith yo ur par tn er du rin g th e c on ver -
sat ion .
Cal l Q ual ity du rin g S ecu re Cal ls
Th e c all del ay in dic ato r c han ges co lor in fi ve ste ps be-
tw een gr een ov er yel low to re d. G ree n in dic ate s th e b est
cal l q ual ity , r ed th e w ors t. D ela y d esc rib es th e p eri od of
tim e it ta kes fo r y ou r v oic e to re ach yo ur par tn er. T his
tim e g ets lo nge r if th e t ran sm iss ion o f t he en cry pte d
vo ice o ver th e t ele ph on e n etw ork ta kes lo ng er, o r
tra nsm iss ion er ror s o ccu r.
Rea son s fo r lo nge r th an nor mal de lay ar e u sua lly ei the r
bad G SM co ver age o r n etw ork co nge sti on . N etw ork
con ges tio n c an of ten be ci rcu mve nte d b y s etti ng up the
cal l a gai n, s om eti mes yo u j ust g et a » bad li ne« . T he
GS M d ata c all m od e, use d b y t he Cry pto Ph on e t o
tra nsp ort th e e ncr ypt ed voi ce dat a d uri ng a c all, h as a
cer tai n d ela y, c au sed b y t he arc hit ect ure o f t he GS M
net wor k. T he GS M n etw ork h an dle s d ata w ith lo wer
pri ori ty tha n v oic e tr an sm iss ion s.
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Usi ng the he ads et
For h an ds fre e o per ati on , a st ere o h ead set is in clu ded
wit h th e G SM K C ryp toP hon e. Y ou ca n p lu g it in an y
tim e, b efo re or du rin g a ca ll, how eve r y ou may te rm i-
nat e a n o ngo in g c all un der so me con dit ion s w hen in -
ser tin g t he hea dse t p lu g o ff- an gle . T he hea dse t c abl e
con nec tor so cke t is on th e lo wer ri ght si de of t he dev ice .
GS MK do es not p rov ide su ppo rt f or pro ble ms cau sed
by usi ng hea dse ts oth er th an th e o ne su pp lie d w ith
you r C ryp toP hon e.
Blu eto oth he ads et
The C ryp toP hon e G 10 h as a B lue too th in ter fac e. W hile
it is pos sib le to use a Blu eto oth h ead set fo r m ak in g
nor mal u nen cry pte d p hon e c alls , w e s tro ngl y n ot r ec-
om men d u sin g a b lu eto oth h ead set d uri ng en cry pte d
cal ls. T he rea son is th at w ith a Blu eto oth h ead set yo u
wou ld bro adc ast th e c on ten ts of y ou r c on fid en tia l c alls
bef ore th ey hav e r eac hed th e e ncr ypt ion en gin e in th e
Cry pto Ph on e. B lu eto oth ra dio si gn als ca n b e r ece ive d
ove r s eve ral h un dre d m ete rs with m ode rat ely so ph ist i-
cat ed eq uip men t, s o a n a tta cke r c ou ld lis ten to yo ur
cal ls eas ily . T he en cry pti on use d w ith B lu eto oth is n o
hu rdl e f or a d ete rm in ed adv ers ary an d d oes n ot o ffe r
su ffi cie nt pro tec tio n. We rec om men d u sin g a w ire
bas ed hea dse t w hen pl aci ng sec ure ca lls .
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