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Science
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9
,
No
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1
,
J
an
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ar
y
201
8
,
p
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3
I
SS
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In
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Un
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atio
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[
1
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.
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itio
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[
2
]
.
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5
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.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2502
-
4752
I
n
d
o
n
esia
n
J
E
lec
E
n
g
&
C
o
m
p
Sci,
Vo
l
.
9
,
No
.
1
,
J
an
u
ar
y
201
8
:
10
2
–
10
4
102
I
t
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d
s
to
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ttin
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[
6
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.
B
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it
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in
g
id
ea
s
,
f
o
r
ex
a
m
p
le,
o
b
j
ec
tiv
e,
p
er
f
o
r
m
i
n
g
ar
tis
t,
p
r
o
t
ec
tio
n
an
d
co
n
f
id
en
tial
it
y
o
b
lig
e
s
,
s
y
s
te
m
s
an
d
w
e
ac
q
u
ai
n
t
co
n
f
ir
m
atio
n
p
r
er
eq
u
is
ite
w
i
th
g
et
p
r
o
v
e
f
o
r
th
e
f
u
lf
ill
m
en
t
o
f
th
e
n
ec
e
s
s
itie
s
th
r
o
u
g
h
r
ev
ie
w
a
n
d
s
tr
aig
h
t
f
o
r
w
ar
d
n
e
s
s
[
7
]
.
T
h
is
e
n
ab
les
u
s
o
n
o
n
e
h
a
n
d
to
r
ec
o
g
n
ize
a
n
d
i
n
v
e
s
ti
g
ate
p
r
o
tectio
n
a
n
d
co
n
f
id
e
n
tialit
y
n
ec
e
s
s
i
ties
a
n
d
th
en
ag
ai
n
to
ch
ec
k
w
h
e
th
er
a
p
ick
ed
clo
u
d
s
en
d
in
g
m
o
d
el
ad
d
r
ess
es
th
e
d
is
tin
g
u
is
h
ed
p
r
er
eq
u
is
ite
s
w
i
th
f
itt
in
g
i
n
s
tr
u
m
e
n
ts
in
v
ie
w
o
f
a
p
ar
ticu
lar
h
ier
ar
ch
ical
s
et
tin
g
[
8
]
.
T
h
e
b
lack
h
o
le
attac
k
s
o
cc
u
r
r
ed
in
r
o
u
tin
g
an
d
t
h
e
ef
f
ec
ts
o
f
p
er
f
o
r
m
an
ce
o
f
g
eo
g
r
ap
h
ical
r
o
u
ti
n
g
i
n
M
A
NE
T
is
d
escr
ib
ed
in
[
9
]
.
B
ased
o
n
n
e
w
cr
y
p
to
g
r
ap
h
ic
s
c
h
e
m
e
a
s
ec
u
r
ed
an
d
p
r
o
tecte
d
in
f
o
r
m
atio
n
s
ce
n
ar
io
i
s
g
en
er
ated
u
s
in
g
d
ig
ita
l
s
ig
n
atu
r
e
[
1
0
]
.
T
h
is
tech
n
iq
u
e
is
b
ased
o
n
u
s
er
au
th
e
n
tica
tio
n
an
d
s
ec
u
r
it
y
m
ec
h
a
n
i
s
m
.
T
h
e
d
ata
h
o
ld
er
n
ee
d
s
to
s
en
d
th
e
n
e
w
f
i
g
u
r
e
co
n
ten
t
to
t
h
e
clo
u
d
,
w
h
ile
t
h
e
clo
u
d
j
u
s
t
r
ep
lace
s
th
e
o
b
s
o
lete
f
ig
u
r
e
m
es
s
ag
e
an
d
d
o
es
n
o
t
h
av
e
to
ex
c
h
an
g
e
it
to
t
h
e
n
o
n
-
d
en
ied
cl
ien
ts
,
s
o
th
e
ex
tr
a
co
r
r
esp
o
n
d
en
ce
co
s
ts
is
i
n
f
o
r
m
atio
n
[
1
1
]
.
2.
P
RO
P
O
SE
D
SYS
T
E
M
T
h
e
n
o
v
elt
y
o
f
th
e
p
r
o
p
o
s
ed
d
is
p
la
y
i
n
g
d
ialec
t
is
th
e
w
a
y
th
at
it
j
o
in
s
id
ea
s
f
r
o
m
t
h
e
n
ec
es
s
itie
s
en
g
i
n
ee
r
i
n
g
,
clo
u
d
co
m
p
u
ti
n
g
,
p
r
o
tectio
n
,
co
n
f
id
en
tialit
y
an
d
a
u
d
itin
g
ar
ea
.
I
t
u
t
iliz
es
n
e
w
id
ea
s
,
f
o
r
ex
a
m
p
le,
clo
u
d
clien
t,
clo
u
d
s
er
v
ice
p
r
o
v
id
er
,
au
d
it,
an
d
in
s
tr
u
m
en
t,
w
h
ic
h
ar
e
i
m
p
o
r
tan
t
to
ev
o
k
e
a
n
d
ex
a
m
in
at
io
n
o
f
n
ec
e
s
s
it
ies
a
n
d
ch
ec
k
s
co
n
f
ir
m
a
tio
n
s
to
b
o
ls
ter
th
e
s
e
p
r
er
eq
u
is
ite
s
i
n
li
g
h
t
o
f
a
u
t
h
o
r
itati
v
e
s
etti
n
g
.
T
h
e
m
eta
-
m
o
d
el
o
f
th
e
d
ialec
t c
h
ar
ac
ter
izes a
ll id
ea
s
.
T
h
e
f
o
ca
l id
ea
o
f
th
e
p
r
o
p
o
s
ed
d
ialec
t is th
at
o
f
a
p
er
f
o
r
m
er
,
w
h
ic
h
s
p
ea
k
s
to
an
ele
m
e
n
t t
h
at
h
as
k
e
y
o
b
j
ec
tiv
es
an
d
g
o
als
i
n
s
id
e
a
f
r
a
m
e
w
o
r
k
o
r
a
h
ier
ar
ch
ical
s
ettin
g
.
A
p
er
f
o
r
m
in
g
ar
tis
t
ca
n
b
e
h
u
m
a
n
,
a
f
r
a
m
e
w
o
r
k
,
o
r
an
a
s
s
o
ciatio
n
.
Fo
r
o
u
r
s
it
u
atio
n
,
a
s
s
o
ciatio
n
,
clo
u
d
clien
t
an
d
clo
u
d
s
er
v
ice
p
r
o
v
id
er
ar
e
th
r
ee
u
n
iq
u
e
s
o
r
ts
o
f
p
er
f
o
r
m
i
n
g
ar
tis
ts
.
A
clo
u
d
clie
n
t
o
n
-
s
cr
ee
n
c
h
ar
ac
ter
ca
n
b
e
i
n
d
iv
id
u
al
o
r
ass
o
ciatio
n
w
h
o
n
ee
d
s
clo
u
d
ad
m
i
n
is
tr
atio
n
an
d
o
r
g
an
izatio
n
m
o
d
el
to
b
o
ls
ter
its
p
ar
ticu
lar
k
e
y
o
b
j
ec
tiv
e
an
d
ex
p
ec
tat
io
n
.
A
clo
u
d
s
er
v
ice
p
r
o
v
id
er
p
er
f
o
r
m
i
n
g
ar
tis
t
h
a
s
t
w
o
n
o
v
el
p
r
o
p
er
ties
,
i.e
.
,
ad
m
in
is
tr
atio
n
a
n
d
d
ep
lo
y
m
en
t
m
o
d
el
to
b
o
ls
ter
th
e
clo
u
d
clien
ts
.
T
h
e
p
er
f
o
r
m
er
a
s
s
o
ciatio
n
s
ettin
g
co
n
s
id
er
s
t
h
e
e
x
te
n
t
o
f
t
h
e
a
u
th
o
r
itat
iv
e
ele
m
e
n
ts
,
f
o
r
ex
a
m
p
le,
o
b
j
ec
tiv
e,
ad
m
in
is
tr
atio
n
s
,
a
n
d
f
o
u
n
d
atio
n
a
n
d
i
n
co
r
p
o
r
ates
m
o
v
e
m
e
n
t
n
ee
d
s
in
to
clo
u
d
th
at
o
u
g
h
t to
b
e
u
p
h
eld
b
y
a
clo
u
d
s
p
ec
ial
is
t o
r
g
a
n
izat
io
n
.
T
h
e
id
en
tif
icat
io
n
a
n
d
an
al
y
s
i
s
o
f
t
h
e
r
esp
ec
ti
v
e
o
r
g
an
izatio
n
’
s
s
ec
u
r
it
y
an
d
p
r
iv
ac
y
r
eq
u
i
r
e
m
en
t
s
i
s
co
n
d
u
cted
.
Secu
r
it
y
m
a
n
a
g
er
an
d
in
ter
n
al
au
d
it
(
i
f
an
y
)
ar
e
m
ain
l
y
i
n
v
o
lv
ed
f
o
r
th
i
s
ac
ti
v
it
y
.
T
w
o
s
tep
s
an
d
t
w
o
r
esp
ec
tiv
e
o
u
tco
m
e
s
ar
e
d
ef
in
ed
,
th
e
Sec
u
r
it
y
a
n
d
P
r
iv
ac
y
r
eq
u
ir
e
m
en
t
id
en
ti
f
icati
o
n
an
d
d
ep
lo
y
m
en
t
s
ce
n
ar
io
d
escr
ip
tio
n
.
On
ce
t
h
e
p
er
ti
n
en
t
p
r
o
tectio
n
an
d
co
n
f
i
d
en
tialit
y
o
b
j
ec
tiv
e
s
an
d
clo
u
d
r
elo
ca
tio
n
n
ee
d
s
h
av
e
b
ee
n
d
is
tin
g
u
is
h
ed
,
an
elicitatio
n
an
d
ex
a
m
in
at
io
n
p
r
ep
ar
e
f
o
r
p
r
o
tectio
n
an
d
a
c
o
n
f
id
en
t
i
alit
y
p
r
er
eq
u
is
ite
is
u
tili
ze
d
.
W
e
co
n
s
tr
u
ct
o
u
r
e
x
a
m
i
n
atio
n
i
n
li
g
h
t
o
f
t
h
e
id
ea
s
o
f
p
r
o
tectio
n
a
n
d
co
n
f
id
e
n
ti
a
lit
y
p
r
er
eq
u
is
ites
,
ch
ar
ac
ter
ized
in
th
e
in
tr
o
d
u
ce
d
m
eta
-
m
o
d
el,
to
e
m
p
o
w
er
d
esig
n
er
s
to
en
o
u
g
h
ca
t
ch
p
r
o
tectio
n
an
d
co
n
f
id
e
n
tialit
y
n
ec
ess
i
ties
.
P
r
o
tectio
n
an
d
co
n
f
id
en
tial
it
y
p
r
er
eq
u
is
ites
ar
e
ev
o
k
ed
co
n
s
id
er
in
g
a
s
s
o
ciatio
n
s
u
b
s
ta
n
ce
s
,
f
o
r
e
x
a
m
p
le,
as
s
o
ci
atio
n
o
b
j
ec
tiv
e,
p
er
f
o
r
m
i
n
g
ar
ti
s
ts
,
clo
u
d
m
o
v
e
m
en
t
n
ee
d
s
,
d
an
g
er
s
an
d
v
u
l
n
er
ab
ilit
ie
s
.
I
n
ad
d
itio
n
,
au
th
o
r
itati
v
e
p
ar
ticu
lar
r
ec
o
r
d
,
f
o
r
ex
a
m
p
le,
h
ier
ar
ch
ica
l
ap
p
r
o
ac
h
es,
o
b
j
ec
tiv
es,
an
d
b
u
s
in
e
s
s
f
o
r
m
s
,
o
u
ter
s
o
u
r
ce
s
,
(
f
o
r
e
x
a
m
p
le,
la
w
s
a
n
d
co
n
tr
o
ls
,
co
n
c
ei
v
ab
le
o
u
t
s
id
e
d
an
g
er
s
d
is
tin
g
u
is
h
ed
)
,
an
d
ap
p
licab
le
in
n
o
v
ati
v
e
li
m
ita
tio
n
s
i
n
l
ig
h
t
o
f
t
h
e
i
n
n
o
v
atio
n
u
tili
z
ed
,
(
f
o
r
ex
a
m
p
le,
i
m
p
er
ativ
e
s
t
h
at
m
a
y
b
e
s
p
ec
ial
f
o
r
d
is
tr
ib
u
ted
co
m
p
u
ti
n
g
s
itu
a
tio
n
s
)
ca
n
li
k
e
w
i
s
e
b
e
u
t
ilized
to
ev
o
k
e
t
h
e
n
ec
es
s
ities
.
T
h
e
d
i
s
tin
g
u
is
h
ed
n
ec
es
s
itie
s
ar
e
d
is
s
ec
ted
in
lig
h
t
o
f
th
e
p
o
ten
tial
d
an
g
er
s
an
d
v
u
l
n
er
ab
ili
ties
o
f
th
e
C
SP
s
u
r
f
ac
e
an
d
its
e
n
co
m
p
a
s
s
in
g
co
n
d
itio
n
.
S
u
b
s
eq
u
en
t
l
y
,
t
h
is
p
r
o
g
r
ess
io
n
li
k
e
w
i
s
e
in
co
r
p
o
r
ates
r
ec
o
g
n
izab
le
p
r
o
o
f
o
f
d
an
g
er
s
an
d
v
u
l
n
er
ab
ilit
ies
to
in
v
est
i
g
ate
t
h
e
n
ec
e
s
s
i
ties
f
o
r
f
u
r
th
er
r
ef
in
e
m
e
n
t.
I
t
i
s
lik
e
w
i
s
e
s
i
g
n
i
f
ica
n
t
th
a
t
p
r
o
te
ctio
n
an
d
co
n
f
id
e
n
tialit
y
p
r
er
eq
u
is
ite
s
ar
e
th
e
s
a
m
e
in
d
ep
e
n
d
en
t
o
f
p
ar
ticu
lar
clo
u
d
o
r
g
an
izatio
n
m
o
d
els.
A
s
e
n
d
in
g
s
it
u
atio
n
is
r
ec
o
g
n
iz
ed
an
d
p
o
r
tr
a
y
ed
.
T
h
e
p
o
r
tr
ay
al
d
ep
en
d
s
o
n
d
ata
id
en
ti
f
ied
w
it
h
th
e
o
r
g
a
n
izatio
n
m
o
d
el
to
b
e
u
tili
ze
d
,
th
e
f
ac
ilit
ati
n
g
m
o
d
el,
th
e
p
er
tin
e
n
t
a
d
m
in
i
s
tr
atio
n
s
an
d
ass
ets to
b
e
s
e
n
t a
lo
n
g
s
id
e
t
h
e
ac
ce
s
s
ib
le
p
r
o
tectio
n
an
d
co
n
f
id
en
tialit
y
co
m
p
o
n
e
n
ts
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
o
n
esia
n
J
E
lec
E
n
g
&
C
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m
p
Sci
I
SS
N:
2502
-
4752
C
lo
u
d
Dep
lo
yme
n
t Meth
o
d
s
I
n
Gu
a
r
a
n
tee
o
f P
r
o
tectio
n
a
n
d
C
o
n
fid
en
tia
lity
C
o
n
s
tr
a
in
ts
(
S
a
r
fa
r
a
z
A
h
med
)
103
3.
DIS
CU
SS
I
O
N
T
r
u
s
t
b
asicall
y
w
o
r
k
s
in
a
b
est
d
o
w
n
m
an
n
er
,
as
ea
ch
lay
er
n
ee
d
s
to
b
eliev
e
th
e
la
y
e
r
p
r
o
m
p
tl
y
u
n
d
er
n
ea
th
it,
an
d
r
eq
u
ir
es
a
s
ec
u
r
it
y
en
s
u
r
e
at
an
o
p
er
atio
n
al,
s
p
ec
ialized
,
p
r
o
ce
d
u
r
al
a
n
d
la
w
f
u
l
lev
e
l
to
e
m
p
o
w
er
s
ec
u
r
e
co
r
r
esp
o
n
d
en
ce
s
w
i
th
it.
A
tr
u
s
ted
test
a
m
e
n
t
f
ills
i
n
as
a
s
o
lid
ele
ctr
o
n
ic
''tr
av
el
p
er
m
it
''
th
a
t
s
ets
u
p
a
s
u
b
s
ta
n
ce
'
s
ch
ar
ac
t
er
,
q
u
alif
icat
io
n
s
an
d
o
b
lig
a
ti
o
n
s
.
T
r
u
s
t
ca
n
b
e
s
ee
n
as
a
ch
ain
f
r
o
m
t
h
e
e
n
d
clien
t,
to
th
e
ap
p
licatio
n
p
r
o
p
r
ieto
r
,
w
h
o
t
h
u
s
co
n
f
id
es
i
n
th
e
f
r
a
m
e
w
o
r
k
s
u
p
p
lier
(
eith
er
at
a
v
ir
t
u
al
o
r
eq
u
ip
m
e
n
t
l
e
v
el
as
p
er
th
e
c
h
o
s
e
b
en
e
f
it
d
i
s
p
la
y
)
.
A
T
r
u
s
ted
T
h
ir
d
P
ar
ty
ca
n
g
i
v
e
t
h
e
r
eq
u
ir
ed
tr
u
s
t
b
y
en
s
u
r
in
g
t
h
at
i
m
p
ar
ti
n
g
p
ar
ties
ar
e
w
h
o
th
e
y
c
lai
m
to
b
e
an
d
h
av
e
b
ee
n
e
x
a
m
i
n
ed
to
h
o
ld
f
ast
to
s
tr
ict
n
ec
es
s
ities
.
T
h
is
p
r
o
ce
d
u
r
e
is
p
er
f
o
r
m
ed
th
r
o
u
g
h
th
e
af
f
ir
m
a
tio
n
p
r
o
ce
d
u
r
e,
am
id
w
h
ich
a
n
elem
e
n
t
r
eq
u
ir
i
n
g
co
n
f
ir
m
atio
n
is
r
eq
u
ir
ed
to
c
o
m
p
l
y
w
i
th
a
n
ar
r
an
g
e
m
en
t
o
f
s
tr
ate
g
ies
a
n
d
n
ec
e
s
s
i
ties
.
T
T
P
is
a
p
er
f
ec
t
s
ec
u
r
it
y
f
ac
ilit
ato
r
i
n
a
n
ap
p
r
o
p
r
iate
d
clo
u
d
co
n
d
itio
n
w
h
er
e
ele
m
en
ts
h
av
in
g
a
p
l
ac
e
w
i
th
p
ar
titi
o
n
ed
au
th
o
r
itat
iv
e
s
p
ac
e
s
,
w
ith
n
o
ea
r
lier
in
f
o
r
m
a
tio
n
o
f
ea
c
h
o
th
e
r
,
r
eq
u
ir
e
b
u
ild
in
g
u
p
s
ec
u
r
e
c
o
m
m
u
n
icatio
n
s
.
4.
CO
NCLU
SI
O
N
C
lo
u
d
r
elo
ca
tio
n
is
a
s
ta
n
d
o
u
t
a
m
o
n
g
s
t
t
h
e
m
o
s
t
cr
itical
c
o
n
ce
r
n
s
th
e
s
e
d
a
y
s
f
o
r
b
o
th
p
r
iv
ate
a
n
d
o
p
en
ass
o
ciatio
n
s
s
i
n
ce
b
ec
au
s
e
o
f
th
e
c
u
r
r
en
t
b
u
d
g
etar
y
ci
r
cu
m
s
tan
ce
s
ea
ch
a
s
s
o
ciatio
n
is
p
o
in
ti
n
g
o
n
co
s
t
d
ec
r
ea
s
es
w
it
h
o
u
t
lo
s
in
g
p
r
o
f
icien
c
y
an
d
ad
m
i
n
i
s
tr
atio
n
q
u
alit
y
.
No
t
w
it
h
s
ta
n
d
in
g
,
b
ef
o
r
e
r
elo
ca
tin
g
ad
m
in
i
s
tr
atio
n
s
,
in
f
o
r
m
atio
n
o
r
f
o
u
n
d
atio
n
i
n
to
th
e
clo
u
d
,
it
is
i
m
p
o
r
tan
t
to
ac
k
n
o
w
led
g
e
an
d
co
m
p
r
eh
e
n
d
th
e
m
o
v
e
m
e
n
t
n
ee
d
s
a
n
d
d
an
g
e
r
s
th
at
clo
u
d
r
elo
ca
tio
n
r
u
i
n
s
.
T
h
ese
d
an
g
er
s
ch
a
n
g
e
a
m
o
n
g
as
s
o
ciatio
n
s
p
ar
ticu
lar
l
y
b
ec
au
s
e
o
f
t
h
e
c
h
an
g
ea
b
ilit
y
o
f
d
ata
a
n
d
in
a
d
d
itio
n
th
e
k
in
d
o
f
clo
u
d
ad
m
i
n
is
tr
atio
n
s
e
v
er
y
ass
o
ciatio
n
w
is
h
es
to
u
tili
ze
.
A
t
last
,
th
e
d
eter
m
i
n
atio
n
o
f
th
e
s
ep
ar
ate
clo
u
d
d
is
p
la
y
t
h
at
w
ill
b
e
r
ec
ei
v
ed
ass
u
m
e
s
a
cr
itical
p
ar
t
o
n
th
e
p
o
ten
tial
d
an
g
er
s
t
h
at
t
h
e
ass
o
ciatio
n
m
a
y
co
n
f
r
o
n
t
to
o
.
I
n
th
is
w
a
y
,
th
e
p
ar
t
o
f
s
ec
u
r
it
y
a
n
d
p
r
o
tectio
n
ar
e
ess
en
tia
l
f
o
r
an
ass
o
ciatio
n
to
ch
o
o
s
e
w
h
ic
h
clo
u
d
ar
r
an
g
e
m
e
n
t
f
i
ts
b
est
its
n
ee
d
s
an
d
p
r
er
eq
u
is
ites
.
RE
F
E
R
E
NC
E
S
[1
]
T
re
a
c
y
B
C,
Bru
e
n
in
g
P
J.
Priva
c
y
&
S
e
c
u
rity
L
a
w
Rep
o
rt:
Priva
c
y
.
S
e
c
u
rity
Iss
u
e
s
Ra
ise
d
b
y
C
lo
u
d
C
o
mp
u
ti
n
g
.
T
h
e
Bu
re
a
u
o
f
Na
ti
o
n
a
l
A
ff
a
irs.
2
0
0
9
.
[2
]
Do
re
y
P
G
,
L
e
it
e
A
.
Co
m
m
e
n
tar
y
:
Clo
u
d
c
o
m
p
u
ti
n
g
–
A
se
c
u
r
it
y
p
ro
b
lem
o
r
so
lu
ti
o
n
?
In
f
o
rm
a
ti
o
n
se
c
u
rity
tec
h
n
ica
l
re
p
o
rt
.
2
0
1
1
;
1
6
.
(
3
):
8
9
-
96.
[3
]
G
ro
b
a
u
e
r
B,
W
a
ll
o
sc
h
e
k
T
,
S
to
c
k
e
r,
E.
Un
d
e
rsta
n
d
i
n
g
c
lo
u
d
c
o
m
p
u
ti
n
g
v
u
ln
e
ra
b
il
i
ti
e
s.
IEE
E
S
e
c
u
rity
&
Pri
v
a
c
y
.
2
0
1
1
;
9
(2
)
:
5
0
-
5
7
.
[4
]
Da
v
iso
n
R,
M
a
rti
n
s
o
n
s
M
G
,
Ko
c
k
N.
P
ri
n
c
ip
les
o
f
c
a
n
o
n
ica
l
a
c
ti
o
n
re
se
a
rc
h
.
In
f
o
rm
a
ti
o
n
s
y
ste
ms
jo
u
rn
a
l
.
2
0
0
4
;
14
(
1
):
6
5
-
8
6
.
[5
]
T
a
k
a
b
i
H,
Jo
sh
i
J
B,
A
h
n
G
J.
().
S
e
c
u
rit
y
a
n
d
p
riv
a
c
y
c
h
a
ll
e
n
g
e
s
in
c
lo
u
d
c
o
m
p
u
ti
n
g
e
n
v
iro
n
m
e
n
ts.
IEE
E
S
e
c
u
rity
&
Priva
c
y
.
2
0
1
0
;
8
(
6
):
2
4
-
31.
[6
]
M
u
laz
z
a
n
i
M
,
S
c
h
rit
tw
ies
e
r
S
,
Leith
n
e
r
M
,
a
n
d
Hu
b
e
r
M
,
W
e
ip
p
l
E
R.
Da
rk
Clo
u
d
s
o
n
th
e
Ho
rizo
n
:
Us
in
g
Clo
u
d
S
to
ra
g
e
a
s
At
ta
c
k
Vec
to
r
a
n
d
O
n
l
in
e
S
l
a
c
k
S
p
a
c
e
.
In
USE
NI
X
se
c
u
rit
y
s
y
m
p
o
siu
m
.
2
0
1
1
:
6
5
-
76.
[7
]
Ja
m
sh
id
i
P
,
A
h
m
a
d
A
,
P
a
h
l
C.
Clo
u
d
m
ig
ra
ti
o
n
re
se
a
rc
h
:
a
s
y
ste
m
a
ti
c
re
v
ie
w
.
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
Cl
o
u
d
Co
mp
u
t
in
g
.
2
0
1
3
;
1
(
2
):
1
4
2
-
1
5
7
.
[8
]
M
o
u
ra
ti
d
is
H,
Ka
ll
o
n
iatis
C
,
Isl
a
m
S
,
Hu
g
e
t
M
P
,
G
rit
z
a
li
s
S
.
Al
ig
n
in
g
S
e
c
u
rity
a
n
d
Priv
a
c
y
to
S
u
p
p
o
rt
th
e
De
v
e
lo
p
me
n
t
o
f
S
e
c
u
re
In
f
o
rm
a
ti
o
n
S
y
ste
ms
.
J
.
UCS
.
2
0
1
2
;
18
(1
2
)
:
1
6
0
8
-
1
6
2
7
.
[9
]
S
h
a
n
t
h
i
H J,
A
n
it
a
E
M
.
Per
f
o
rm
a
n
c
e
a
n
a
lys
is
o
f
b
la
c
k
h
o
le a
tt
a
c
k
s in
g
e
o
g
ra
p
h
ica
l
r
o
u
ti
n
g
M
ANE
T
.
2
0
1
4
.
[1
0
]
G
a
n
e
sh
k
u
m
a
r
K,
A
riv
a
z
h
a
g
a
n
D.,
G
e
n
e
ra
ti
n
g
a
d
ig
it
a
l
si
g
n
a
tu
re
b
a
se
d
o
n
n
e
w
c
r
y
p
to
g
ra
p
h
ic
sc
h
e
m
e
f
o
r
u
se
r
a
u
th
e
n
ti
c
a
ti
o
n
a
n
d
se
c
u
rit
y
.
In
d
ia
n
J
o
u
r
n
a
l
o
f
S
c
ien
c
e
a
n
d
T
e
c
h
n
o
l
o
g
y
.
2
0
1
4
;
7
(S
6
):
1
-
5.
[1
1
]
Krish
n
a
Ke
e
rth
i
Ch
e
n
n
a
m
,
a
n
d
M
.
A
k
k
a
Lak
sh
m
i.
,
Clo
u
d
S
e
c
u
ri
ty
in
Cr
y
p
t
Da
tab
a
se
S
e
rv
e
r
Us
i
n
g
F
in
e
G
ra
in
e
d
A
c
c
e
ss
Co
n
tro
l
.
I
n
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
o
f
El
e
c
trica
l
a
n
d
C
o
mp
u
ter
En
g
i
n
e
e
rin
g
(
IJ
ECE
).
2
0
1
6
;
6
(3
);
9
1
5
~
9
2
4
.
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