3 5-Keamanan Komputer

8/18/2019 3 5-Keamanan Komputer

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KEAMANAN

KOMPUTERADITYO NUGROHO,ST TEKNIK PERANGKAT LUNAK UNIVERSITASPGRI RONGGOLAWE TUBAN

PERTEMUAN 5 – ALGORITMA kriptogr!"o#$r%


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A&gorit" 'ip($r )%g *$r*+i+BIT *i&%g% *i%$r-

S$". #t *ik it. k.%'i,p&i%t$k+, ".p.% 'ip($rt$k+#i%)tk% #&" r%gki%+tri%g- *i%$r

Ap it. A&gorit"

Kriptogr! Mo#$r%/


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U"."%) #t #ipro+$+ #&" *$%t.k*&ok0*&ok *it )%g #it.&i+k% #&"+$1."&( 'r t$rg%t.%g p# p%1%g

*&ok2

Mi+& P 3 4 4 4 4 4 4 4 #i*gi

"$%1#i *it )%g p%1%g%) 6 *it"$%1#i 3

44 444 44 &i+ 7 48 9

R%gki% BIT #%

Op$r+i%)


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Bi& p%1%g r%gki% *it ti#k(*i+ #i*gi #$%g% .k.r% *&ok

)%g #it$tpk%, "k *&ok t$rk(ir#it"*(k% #$%g% *it0*it +$".)%g #i+$*.t PADDING BIT2

Mi+& 3 4 4 4 4 4 4 4 #i*gi#$%g% *&ok 5 *it "$%1#i 3 444444 0004

R%gki% BIT #%

Op$r+i%)


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:r &i% .%t.k "$%)tk% r%gki% *it#&( #$%g% %ot+i ($k+#$+i"& HE;-2R%gki% #i*gi "$%1#i *&ok )%g *$r.k.r% 6

*it 3 < 4 < 4 4 < = 44 < 8

4 < 6 44 < 5 44 < 9 444 < >

4 < ? 44 < 7 44 < A 444 < B

44 < :444 < D444 < E 4444 < @

R%gki% BIT #%

Op$r+i%)


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Mi+& P 3 4444444 #i*gi"$%1#i 44 444 44, #&"

%ot+i HE; "$%1#i 7 D 9

R%gki% BIT #%

Op$r+i%)


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Op$rtor *i%$r )%g +$ri%g #ig.%k%#&" 'ip($r )%g *$rop$r+i #&""o#$ *it #&( ;OR t. $'&.+i$0OR2 Not+i "t$"ti+ ;OR #&(

<

4 < 44 < 4

4 4 <

R%gki% BIT #%

Op$r+i%)


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Mi+&k% , *, ' #&( p$.*(*oo&$%, "k (.k."0(.k."

)%g t$rkit #$%g% op$rtor;OR 3

R%gki% BIT #%

Op$r+i%)


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Cik #. r%gki% *it#iop$r+ik% #$%g% ;OR, "k

op$r+i%) #i&k.k% #$%g%"$%g0;OR0k% +$tip *it )%g*$rkor$+po%#$% #ri k$#.

r%gki% *it2:o%to( 3

R%gki% BIT #%

Op$r+i%)


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D$%g% 'r "$%g0;OR0k% P&i%t$k+P- #$%g% K.%'i K- +$(i%gg"$%g(+i&k% :ip($rt$k+ :-

Kr$% "$%g0;OR0k% %i&i )%g

+" #. k&i *$rt.r.t0t.r.t"$%g(+i&k% %i&i +$".&, "k#$krip+i "$%gg.%k% p$r+"% 3

A&gorit" E%krip+i #$%g%

;OR S$#$r(%


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A&gorit" E%krip+i #$%g%

;OR S$#$r(%


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A&gorit" K.%'i Si"$tri P$%giri" #%

p$%$ri" "$"i&iki k.%'i )%g +"2B$rop$r+i #&" "o#$ *it2

42:ip($r A&ir% Str$" :ip($r-

B$rop$r+i p# p&i%t$k+'ip($rt$k+

#&" *$%t.k BIT TUNGGAL2 R%gki%*it #i$%krip+i #i#$krip+i *it p$r *it2

Kt$gori :ip($r K.%'i

Si"$tri


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=2 :ip($r B&ok B&o'k :ip($r-

B$rop$r+i p# p&i%t$k+'ip($rt$k+

#&" *$%t.k BLOK BIT2 R%gki%*it #i*gi "$%1#i *&ok0*&ok #%g.k.r% t$rt$%t.2 #i$%krip+i #i#$krip+i *&ok p$r *&ok2

Kt$gori :ip($r K.%'i

Si"$tri


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P# 'ip($r &ir%, *it (%) "$"p.%)i#. *.( %i&i, +$(i%gg pro+$+ $%krip+i(%) "$%)$**k% #. k$#% p#

*it 3 *$r.*( t. ti#k *$r.*(2

D. k$#% t$r+$*.t #it$%t.k% o&$(

ALIRAN0KUN:I k$)+tr$"- )%g#i*%gkitk% o&$( PEMBANGKIT ALIRANKUN:I k$)+tr$" g$%$rtor-2

:ip($r A&ir% Str$"

:ip($r-


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K$"%% +i+t$" i%i +$p$%.(%)

*$rg%t.%g p# k$)+tr$" g$%$rtor2 Cik )%g #i*%gkitk% (%) *it ,"k'ip($rt$k+ < p&i%t$k+ Ti#k *$rg.%

:ip($r A&ir% Str$"

:ip($r-KeystreamGenerator

KeystreamGenerator

pi

ki

ci pi

ki

PlainteksEnkripsi

Keystream Keystream

Cipherteks PlainteksDekripsi


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Cik k$)+tr$" g$%$rtor"$%g$&.rk% &ir% k.%'i

#$%g% po& 490*it )%g*$r.&%g, "k &gorit"$%krip+i%) "$%1#i +" p$r+i+

#$%g% ;OR +$#$r(% #$%g%ti%gkt k$"%% )%g r$%#(2

:ip($r A&ir% Str$"

:ip($r-


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Cik k$)+tr$" g$%$rtor "$%g$&.rk%&ir% k.%'i )%g *$%r0*$%r 'ktr.&) r%#o"-, "k &gorit"$%krip+i%) +" #$%g% o%$0ti"$ p##$%g% ti%gkt k$"%% )%g+$"p.r%2 D&" (& i%i &ir% k.%'i

+" p%1%g%) #$%g% p%1%gp&i%t$k+ +$(i%gg k% #i#ptk%.%*r$k*&$ 'ip($r2

:ip($r A&ir% Str$"

:ip($r-


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K$+i"p.&% 3 (%) #$%g%p$r(it.%g% ;OR +$#$r(%,

KUN:I A:AK )%g #i0g$%$rt$SEPANCANG p&i%t$k+ #% "$to#$$%krip+i ONE0TIME PAD, k%

#i#ptk% 'ip($rt$k+ )%g +.&it#ip$'(k%2

:ip($r A&ir% Str$"

:ip($r-


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R%gki% *it0*it p&i%t$k+ #i*gi"$%1#i *&ok0*&ok *it #$%g% p%1%g

+", *i+%) 960*it t. &$*i(2

K$".#i% +$tip *&ok #i0$%krip+i

#$%g% *it0*it k.%'i )%g p%1%g%)+" #$%g% p%1%g *it #&" *&okp&i%t$k+2

:ip($r B&ok B&o'k :ip($r-


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A&gorit" 'ip($r *&ok "$%gg*.%gk%*$*$rp t$k%ik kriptogr! k&+ik #&"pro+$+ $%krip+i +$(i%gg #pt "$%1#i

+.p$r0$%krip+i2

1.Substitusi

M$%gg%tik% +t. t. +$k."p.&%*it p# *&ok p&i%t$k+ t%p "$r.*(.r.t%%)2



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2. Transposisi atau permutasi

M$"i%#(k% t. "$%gg$+$r

po+i+i *it p# *&ok p&i%t$k+*$r#+rk% t.r% t$rt$%t.2

3. Ekspansi

M$"p$r*%)k 1."&( *it p# *&okp&i%t$k+ *$r#+rk% t.r%t$rt$%t.2 Mi+& 8=0*it "$%1#i 6?0*it2



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4. Kompresi

K$*&ik% #ri $k+p%+i,

1."&( *it p# *&ok p&i%t$k+#i""ptk% *$r#+rk%t.r% t$rt$%t.2



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T(.% 4767, S(%%o% "$%g$".kk%#. pri%+ip prop$rti$+- p$%)%#i%$%'o#i%g- #t #&" "k&(%))%g *$r1.#.& :o"".%i'tio% T($or) oS$'r$') S)+t$"+2

K$#. pri%+ip t$r+$*.t #ig.%k% #&"p$r%'%g% 'ip($r *&ok )%g k.t2



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1. Confusion

M$%)$"*.%)ik% (.*.%g% pp.%%tr p&i%t$k+, 'ip($rt$k+ #%k.%'i2 H& i%i k% "$"*.tkript%&i+ r.+t+i .%t.k "$%'ripo&0po& )%g ".%'.& p#

'ip($rt$k+2 :o%.+io% k% "$"*.t(.*.%g% +tti+tik p&i%t$k+,'ip($rt$k+ #% k.%'i "$%1#i r."it2



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2. Diusion

M$%)$*rk% p$%gr.( +t.

*it p&i%t$k+ t. k.%'i k$+$*%)k ".%gki% 'ip($rt$k++$(i%gg p$r.*(% p#

'ip($rt$k+ ti#k #pt#ipr$#ik+i2



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U%t.k "$%#ptk% k$"%%)%g ti%ggi, pri%+ip 'o%.+io% #%

#iF.+io% #i.&%g *$rk&i0k&i p#tip0tip *&ok $%krip+i #$%g%ko"*i%+i )%g *$r*$#2



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Dit.&i+ t%g% p# k$rt+ o&io*$rgri+ .t.( ti#k #i+o*$k- 3

C$&+k% "$%g$%i A&gorit"E%krip+i

R:6

A5

T.g+

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