Internati
o
nal
Journal of Ele
c
trical
and Computer
Engineering
(IJE
CE)
V
o
l.
5, N
o
. 2
,
A
p
r
il
201
5, p
p
.
17
5
~
17
6
I
S
SN
: 208
8-8
7
0
8
1
75
Jo
urn
a
l
h
o
me
pa
ge
: h
ttp
://iaesjo
u
r
na
l.com/
o
n
lin
e/ind
e
x.ph
p
/
IJECE
Editorial
Social Network Applications and
Free Online Mobile Numbers:
Real Ri
sk
M
e
h
d
i
Da
d
kha
h*
1
, T
o
le Su
tikno
2
, Sh
ah
ab
oddin
Sh
ams
h
irband
3
1
Young Resear
chers and
Elite Club, Tiran
Bran
ch
, Islamic Azad U
n
iversity
, Tiran
,
Iran
2
Department of Electrical
Eng
i
n
eering
,
Un
iv
ersitas Ahmad Dahlan, Yog
y
ak
arta, I
ndonesia
3
Department
of
Computer
S
y
stem and
Inform
ation
Techno
log
y
,
Faculty
of
C
o
mputer Science
and
Information
Techno
log
y
, Un
iversity
of
Malay
a
, 50603
Kuala
Lumpur, Malay
s
ia
*Corresponding
author; e-mail: d
a
dkhah80@gmail.com
1
, tole@ee.uad.ac.id
2
Soci
al
net
w
or
k ap
pl
i
cat
i
ons
are bei
n
g m
o
re
wi
del
y
us
ed am
ong u
s
e
r
s an
d ne
w t
y
pes o
f
su
c
h
applications are created by develope
rs
. Al
m
o
st a
ll users who us
e sm
art phone
s are us
ers of suc
h
application
[1]. Major concern in t
h
ese
appli
cations is pri
v
acy and security [2
]. We
can nam
e
W
h
ats
A
pp, Vibe
r,
Facebook, Telegram
,
Line, WeChat
a
nd B
eetalk as the
m
o
st popular
app
lications. T
h
ere a
r
e also
website
s
which provide
online num
bers
in
order
t
o
receive SMS. The goal
of
t
h
is website is providi
n
g anonym
ous
vi
rt
ual
p
h
one
num
ber t
o
p
r
o
t
ect
users fr
o
m
spam
. Al
so t
h
ese si
t
e
s pro
v
i
d
e di
ffe
rent
num
ber fr
om
di
ffe
re
nt
cou
n
t
r
i
e
s an
d l
e
t
peopl
e t
o
ca
n use t
h
em
for
di
ffer
e
nt
ap
plication. T
h
e services of thes
e websites are di
vide
d
i
n
t
o
t
w
o
g
r
ou
p
s
:
su
bscri
p
t
i
o
n
servi
ces
i
n
w
h
i
c
h a
u
n
i
q
ue
n
u
m
ber i
s
assi
g
n
e
d t
o
t
h
e
user
by
c
h
ar
gi
n
g
hi
m
/
her
and free servi
ces in which
user ca
n see the recei
ve
d messages of s
o
m
e
online num
bers without any
regi
st
rat
i
o
n.
Ta
bl
e 1
s
h
o
w
s e
x
am
pl
es of
t
h
es
e we
bsi
t
e
s.
Tabl
e 1. Free o
n
l
i
n
e num
bers fr
om
di
ffere
nt
cou
n
t
r
y
Website
URL
Country availability in f
ree servic
e
Average Visitor p
er day
http://receives
m
so
nline.co
m
Canada,
Finland,
Ger
m
any
,
United
Kingdo
m
,
Sweden,
Poland
4460
http://www.rec
e
ives
m
s
online.net
Canada,
Ger
m
an
y
,
United Kingdo
m
,
Sweden,
4420
http://receive-s
m
s
-online.
co
m
Norway, Poland,
Ukraine, G
e
r
m
any
5000
http://receive-s
m
s
-
now.co
m
Canada,
Finland,
Ger
m
any
,
Sweden,
Poland,
M
e
xico,
B
e
lgiu
m
,
Hong Kong
4100
http://hs3x.co
m
Canada,
Ger
m
an
y
,
United Kingdo
m
,
Sweden, US
A
4140
M
o
st
com
m
uni
cat
i
on an
d s
o
ci
al
net
w
o
r
k a
p
p
l
i
cat
i
ons
of sm
art
ph
o
n
e use
us
ers'
cell phone num
b
ers
for au
th
en
ticatio
n
;
th
ey ask
user to en
ter h
i
s o
r
h
e
r cell
p
h
o
n
e
nu
m
b
er wh
ile in
stallin
g
th
e app
licatio
n; and
aft
e
r he or sh
e
ent
e
rs
t
h
e p
h
o
n
e n
u
m
b
er an
SM
S
co
nt
a
i
ni
ng
an
act
i
v
at
i
on
c
ode
i
s
sent
t
o
use
r
fr
om
t
h
e
application server. T
h
e
user
can
use the
social networ
k a
ppl
i
cat
i
o
n aft
e
r ent
e
ri
n
g
t
h
e
code
an
d t
h
e
defa
ul
t
n
u
m
b
e
r
o
f
th
e
ap
p
lication
is set th
e pho
n
e
nu
m
b
er wh
ich
t
h
e
u
s
er en
ters
d
u
ring
activ
ati
n
g th
e app
licatio
n
.
In
othe
r word the
s
e application
use
phone
num
b
er for au
t
h
en
ticatio
n
an
d an
y p
e
op
le access to
ph
on
e
nu
m
b
er
can see
all inform
ation a
n
d pe
rsonal
data.
M
a
ny
users
us
e websi
t
e
s p
r
o
v
i
d
i
n
g f
r
ee n
u
m
bers for
rece
i
v
i
ng
SM
S i
n
or
der t
o
ent
e
r t
h
ei
r n
u
m
b
ers
in
th
eir so
cial n
e
two
r
k
ap
p
licatio
n
s
.
After installin
g
th
e so
cial n
e
twork
app
lication, t
h
e user ente
rs one
of t
h
e
num
bers e
x
i
s
t
i
ng i
n
SM
S
rec
e
i
v
i
ng
p
r
o
v
i
d
e
r
we
bsi
t
e
s i
n
st
ead o
f
hi
s/
her
ow
n
ph
o
n
e n
u
m
ber and act
i
v
at
es t
h
e
appl
i
cat
i
o
n. T
h
e
m
a
i
n
pro
b
l
e
m
of t
h
i
s
act
i
v
at
i
on m
e
t
hod i
s
t
h
at
i
t
i
s
possi
bl
e several
us
ers use a
free
num
ber
for activating the application. Ther
e
f
ore
,
the
y
can access
messages sent
to each
othe
r
and
one
of the
basic
pri
n
ciples of s
ecurity [3], i.e.
confide
n
tiality is violated. For e
x
am
ple
we visited a free SMS receivi
ng
p
r
ov
id
er
w
e
b
s
i
t
es an
d
ob
served
th
at th
e
Lin
e
app
licatio
n h
a
s
b
een activ
ated
b
y
th
e sa
m
e
n
u
m
b
e
r
fo
r
154
ti
m
e
s. Fig
u
r
e
1
sho
w
s web
s
i
t
e th
at prov
id
e free on
lin
e num
b
e
r (h
ttp
://receiv
e
sm
so
n
line.co
m
)
with
d
i
fferen
t
soci
al
net
w
o
r
k
appl
i
cat
i
o
n t
h
a
t
regi
st
ere
d
by
i
t
s
num
bers i
n
one
day
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
S
SN
:
2
088
-87
08
IJEC
E
V
o
l
.
5,
No
. 2, A
p
ri
l
20
15
:
17
5 – 1
7
6
17
6
Fi
gu
re
1.
N
u
m
b
er
o
f
regi
st
ere
d
a
ppl
i
cat
i
o
n
by
f
r
ee on
lin
e nu
m
b
er
w
e
b
s
ite in
on
e d
a
y.
In add
itio
n, some ap
p
licatio
ns su
ch
as Teleg
r
am
sto
r
e
u
s
er inform
atio
n
lik
e prev
iou
s
messag
e
s and
pers
onal picture in thei
r se
rver.
Wh
en anot
her application is activated
by the sam
e
fre
e num
b
er, all
their
pri
v
ate information is accessible for t
h
e second pe
rs
on. In som
e
case att
acker can c
h
a
nge
user’s pa
s
s
word
and gain access to their in
form
ation. For
exam
ple if user
used
free online num
b
er for his/her
Facebook
account, attackers can
restore
his/he
r pass
word.
Ta
ble
2 s
h
ows vul
nera
ble
application t
o
free online
m
obile
num
bers.
T
h
es
e ap
pl
i
cat
i
on
u
s
e SM
S a
u
t
h
e
n
t
i
cat
i
on t
h
at
ca
n
be e
xpl
oi
t
by
at
t
ackers,
i
n
c
a
se t
h
at
a
ppl
i
c
at
i
on
u
s
ed
call au
t
h
en
ticatio
n
it is
no
t po
ssi
b
l
e to
ex
p
l
o
it b
y
attack
ers.
Tab
l
e
2
.
Vu
ln
erab
le app
licati
o
n to
free on
line m
o
b
ile n
u
m
b
e
rs.
Application or se
rvice na
m
e
Vulnerable
Description
Viber
Yes
Allow user
to
r
e
gister
differ
e
nt a
pplications with sam
e
n
u
m
ber
I windows ver
s
ion
L
i
ne
Yes
Allow user
to
r
e
gister
diffe
r
e
nt applications with sam
e
n
u
m
ber
W
h
atapps
Yes
Allow user
to
r
e
gister
di
ffer
e
nt applications with sam
e
n
u
m
ber
Wechat
Yes
Allow user to
register di
ffer
e
nt applications with sam
e
n
u
m
ber
T
e
legr
a
m
Yes
Allow user
to
r
e
gister
di
ffer
e
nt applications with sam
e
n
u
m
ber
Facebook
Yes
I
t
I possible that attacker
restor
e pass
wor
d
by
using fr
ee nu
m
b
er
Beetalk
Yes
Allow user to
register di
ffer
e
nt applications with sam
e
n
u
m
ber
So the SMS receiving provi
der
websites should
not be use
d
for activating c
o
mm
unication
appl
i
cat
i
o
ns.
On
t
h
e
ot
her
h
a
nd
, t
h
e
devel
ope
rs
o
f
t
h
e
s
e
ap
pl
i
cat
i
ons
s
h
o
u
l
d
fi
nd
a s
o
l
u
t
i
o
n
fo
r t
h
i
s
m
a
jo
r
weak
ness
an
d
do
n'
t
al
l
o
w act
i
v
at
i
n
g
se
veral
sim
i
l
a
r appl
i
cat
i
ons
by
t
h
e
sa
m
e
num
ber.
Refere
nces
[1]
Zin T,
Tin T
,
Ham
a
H, Toriu T.
Knowledg
e based Social
Network Applic
ations to Disaster Event
Analy
s
is
.
Proceedings of
t
h
e Int
e
rna
tiona
l
MultiConfer
enc
e
of
E
ngin
eers
a
nd Com
puter Sci
e
ntists. Hong Ko
ng. 2013:
1-6.
[2]
Chin E
,
Fe
l A. P,
Se
ka
r V,
Wa
gne
r D.
Measuring User C
onfiden
ce in
S
m
artphone Secu
rity and Privacy
.
Proceedings of
t
h
e E
i
ghth S
y
m
p
osium
on Usable
Privac
y
and
Sec
u
rit
y
. W
a
shingto
n
. 2012;
1-16.
[3]
Pra
s
a
d
P,
Ojha
B,
Sha
h
i R.
R,
La
l R.
3 Dim
e
nsional Security in
Cloud Computin
g.
3rd Internatio
nal Confer
ence
on
Computer Research and
Develop
m
en
t (ICCRD).
Shanghai. 2011;
3: 198-201.
0
20
40
60
80
100
120
140
160
180
Number
of
Registered
application
Service
Name
(application)
Evaluation Warning : The document was created with Spire.PDF for Python.