8/9/2019 Secure Digital Encryption

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ZBJRPB BOJP]XMGO

D Hmkmxdc Hdxd Bojp}vxmgoVpgkpda

8/9/2019 Secure Digital Encryption

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D {gph d`grx ZB

gob gi xlb zxpgokbzx bojp}vxmgo xggcz dydmcd`cb

Bojp}vxmgo mz xlb vpgjbzz {lbpb`} jghbzdpb rzbh xg dxxbavx xg jgojbdc xlbabdomok gi d abzzdkb

Jp}vxgkpdvl} mz xlb zjmbojb gi {pmxmokabzzdkbz mo zbjpbx jghbz / Mx mz d`grx xlbpmklx xg vpmydj}# ipbbhga gi zvbbjl#ipbbhga gi vgcmxmjdc dzzgjmdxmgo# ipbbhga

gi xlb vpbzz# ipbbhga ipga ropbdzgod`cbzbdpjl doh zbm~rpb# ipbbhga xg `b cbixdcgob

xg vpgagxb d{dpbobzz gi xlb vpmydj} mzzrbmo d hmkmxdc dkb

8/9/2019 Secure Digital Encryption

3/12

Lg{ Xlmz Abxlgh [gpez77

Xlmz bxlgh

ccg{z g xg

zb h

c l bxm c h xm bpm igp

ipg xlb zb hbp

xg xlb pb mb bp/

]g p cm Eb mz

zbh xg b p x

bzz b

}gr+cc krdph}grppm xb Eb zbjpbx

Xlb Vpmydxb Eb}mz

rzbh xghb p x

hdxd xldx ldyb`bbo bojp}vxbh

rzmok }grpVr`cmj

Eb}/

8/9/2019 Secure Digital Encryption

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Vr`cmj doh Vpmydxb Eb} bojp}vxmgo

x b abzzdkb bojp}vxbhrzmok}grpVr`cmj Eb} jdo

goc} `b hbjp}vxbh `}}gr#

x b g{obpgi x b

jgppbzvgohmok Vpmydxb Eb}bojp}vxmgo zgcybz 4gi0

adngp vpg`cbaz {mxl

gchbp abxlghz# odabc}

x dx }gr dh xg zgab g{zldpb xlb eb} {mx

do}gob }gr{doxbh xg `b

d`cb xgpbdh ,hbjp}vx- }grp

zbjpbx abzzdkb

8/9/2019 Secure Digital Encryption

5/12

Xlb zbjgoh dngpvpg`cb {mxl

gchbp bxlghz

Rocmeb bdpcmbpbojp vxmgo

bxlghz# xlb zbjrpmx} gi

ZB bojp}vxmgo cmbz boxmpbc}

{mxl xlb eb}/

8/9/2019 Secure Digital Encryption

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Eb} dxxpm`rxbz gi

Zbjpbx eb} yz/ r`cmj eb}

Xlgrzdohz }bdpz rzb

HBZ

Idzx

Eb}z zldpbh`bx{bbo rzrdcc}goc} 0 vbgvcb

40< `mx

g ogo!pbvrhmdxmgo,obbh :phvdpx} dz{mxobzz-

Cbzz xldo 26 }bdpz

ZD

Zcg{

pmydxb> jgojbdcbh

Vr`cmj> {mhbc}zldpbh

4#608

gopbvrhmdxmgo>dox hbo} ldymok

zbox d bzzdkb

8/9/2019 Secure Digital Encryption

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Ygjd`rcdp}# hbimomxmgoz# doh djpgo}az

}aabxpmjbojp}vxmgo

Dz}aabxpmj

bojp}vxmgoVcdmoxb|x

}vlbpxb|x

p}vxdodc}zx

Im,o-1* vgzmxmybmoxbkbpz 3opbcdxmybc} vpmab xg o

HBZ1HdxdBojp}vxmgoZxdohdph

ZD1 dxmgodcZbjrpmx} Dkboj}

Drxlboxmjdxmgo

Ado!mo!xlb!amhhcb

XpdvhggpzEb} bzjpg{

@prxbigpjb dxxdje

8/9/2019 Secure Digital Encryption

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Vr`cmj eb} bojp}vxmgo z}zxbaz

4=;9>Hmiimbdoh Lbccado

Abpecb!Lbccado Eodvzdjez

4=; mybzx!Zldamp!Dhbcado , ZD-4=Bc kdadcdohhmkmxdc zmkodxrpb

Ldzl dckgpmxla

8/9/2019 Secure Digital Encryption

9/12

PZ Bojp}vxmgo

gvbpdxbz {mx dpmx abxmj agh o

b1bojp}vxmgoeb}5 h1hbjp}vxmgoeb}

V1vcdmoxb|x!!!? Vb agh o 1j}v bpxb|x

,Vb-h agh o 1 V pbjgybpbh vcdmoxb|x

Bojp}vxmgo doh hbjp}vxmgo dpb arxrdcmoybpzbzdoh jgaarxdxmyb

Zbcbjx cdpkbo1vt v ) t vpmab

Jlggzbbpbcdxmybc} vpmab xg ,v!4-,t!4-

Zbcbjx h zg b.h14 agh ,v!4-,t!4-

pb.h14 agh im,o- dz im,v-1v!4igpv vpmab

Brcbp!Ibpadx>|..im,o-14agh oigpdcc|pbcdxmybc}vpmab xg o

8/9/2019 Secure Digital Encryption

10/12

B|davcb

Vpmydxbeb} Vr`cmj eb}

Zrvbp!

mojpbdzmok

zbtrbojb

\ Agh 4 4

4

9= 9=

J 44 4

4 H

B 9 9

= 44

8/9/2019 Secure Digital Encryption

11/12

Vr`cmj eb} jp}vxgkpdvl} mz `dzbh

go arcxmvcmjdxmybmoybpzbzZrvvgzb abzzdkb xg bojp}vx mz D@J

Xpdozcdxb xg 0:%9=%481469

469mz zbox

Zmojb 0:.0014 agh 464 xlbpbjmvmbox {mcc

arcxmvc} 469|0010::01= agh 464

Doh moibpxldx xlb abzzdkbmz D@J zmojb

=14%:%2Domoxbpjbvxgp{mcc zvboh d cgok xmab

imkrpmokmx grx/

8/9/2019 Secure Digital Encryption

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X OE ]GR