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Encrypted Document Analysis

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53 views27 pages

Encrypted Document Analysis

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_S.

CFJ@D@O _AR@F‐_ L@HL _OLFFI


OG^S@B@OASG
Sl`s `s tf ogrt`by tlat Oacgt ^fii Df5 VVVVVVVVVVVVVVVVVVVVVVVVVV
lass u o o g s s b u i i y o f j p i g t g c t l g p r f e g o t X f r k g d
t ` t i g c
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`d tlg sunegot @DBF^JAS@O_ ]^AOS@OG_ (=27) ia`c cfwd `d


tlgrghuiat`fds fb ON_G bfr tlg purpfsg fb ]raot`oai Gxaj`dat`fd `d Oiass \@@ tfng lgic
`d _t. Cfj`do _av`f‐s L`hl _olffi fdVVVVVVVVVVVVVV.
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=7_P_SGJ CGRGIF]JGDS I@BG OPOIG (_CIO)
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1 > N @ N I @ F H ^ A ] L P
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Apart brfj tlg gbbfrts fb jg, tlg suoogss fb ady prfegot cgpgdcs iarhgiy fdtlg
gdofurahgjgdt adc hu`cgi`dgs fb jady ftlgrs. @ takg tl`s fppfrtud`ty tf gxprgssjy
hrat`tucg tf tlg pgfpig wlf lavg nggd `dstrujgdtai `d tlg suoogssbui ofjpigt`fdfb tl`s
prfegot.@ gxprgss cggp sgdsg fb hrat`tucg tf aij`hlty Hfc bfr h`v`dh jg
strgdhtl bfr tlg suoogssbui ofjpigt`fd fb tlg prfegot.@ gxprgss jy lgartbgit
hrat`tucg tf jy pargdts bfr ofdstadt gdofurahgjgdt wl`ig oarry`dh fut tl`s
prfegot.@ hratgbuiiy aokdfwigchg tlg ofdtr`nut`fd fb tlg `dc`v`cuais wlf ofdtr`nutgc
`dnr`dh`dh tl`s prfegot up tf tl`s igvgi, wlf ofdt`dugs tf iffk abtgr jg cgsp`tg jy
biaws,@ g x p r g s s j y c g g p s g d s g f b h r a t ` t u c g t f t l g i u j ` d a r y
Slg ]r`do`pai, _t.Cfj`d`o _av`f‐
s L ` h l _ o l f f i ] a t d a w l f l a s n g g d o f d t ` d u f u s i y j f t ` v a t ` d h a d c gxtgdc`dh
tlg`r lgip`dh ladc tf us.@ g x p r g s s j y s ` d o g r g t l a d k s t f t l g a o a c g j ` o ` a d S l g
R ` o g ] r ` d o ` p a i , _ t . Cfj`d`o _av`f‐s L`hl _olffi ]atda, bfr ofdstadt gdofurahgjgdt adc
tlg hu`cadogprfv`cgc cur`dh tl`s prfegot@ aj fvgrwlgijgc tf gxprgss jy tladks tf
Slg Acj`d`strat`vg Fbb`ogr bfr prfv`c`dh jg ad `dbrastruoturg adc jfrai suppfrt wl`ig
oarry`dh fut tl`s prfegot `d tlgsolffi.J y s ` d o g r g t l a d k s t f
Jrs.
, Jastgr @d-olarhg, A hu`cg,
Jgdtfr , wlfor`t`oaiiy rgv`gwgc jy prfegot adc lgipgc `d sfiv`dh gaol
a d c g v g r y p r f n i g j , foourrgc cur`dh `jpigjgdtat`fd fb tlg prfegotSlg hu`cadog adc
suppfrt rgog`vgc brfj aii tlg jgjngrs wlf ofdtr`nutgc adc wlf arg ofdtr`nut`dh tf tl`s
prfegot, was v`tai bfr tlg suoogss fb tlg prfegot. @ ajhratgbui bfr tlg`r ofdstadt suppfrt
adc lgip.
3

]^FEGOS FD H^FOG^P _LF] JADAHGJGDS _P_SGJ@DS^FCWOS@FD


Sl`s sfbtwarg `s usgc tf ja`dta`d tlg slfp oustfjgr cgta`i, prfcuot cgta`is,Xfrkgr
cgta`i ja`dta`d tlg slfp `d upcatgc adc ja`dta`d rgofrcs fb `d adc fut catafb slfp
FNEGOS@RG_ FB SLG ]^FEGOS
Slg fnegot`vg fb tl`s prfegot `s tf igt tlg stucgdts appiy tlg
prfhrajj`dhkdfwigchg `dtf a rgai- wfric s`tuat`fd/prfnigj adc gxpfsgc
t l g s t u c g d t s l f w prfhrajj`dh sk`iis lgips `d cgvgifp`dh a hffc
sfbtwarg.1.Xr`tg prfhrajs ut`i`z`dh
jfcgrd sfbtwarg tffis.> . A p p i y f n e g o t f r ` g d t g c p r f h r a j j ` d h p r ` d o ` p i g s g b
b g o t ` v g i y w l g d c g v g i f p ` d h sjaii tf jgc`uj s`zgc prfegots.?.Xr`tg gbbgot`vg
prfogcurai ofcg tf sfivg sjaii tf jgc`uj s`zgc
prfnigjs.3 . _ t u c g d t s w ` i i c g j f d s t r a t g a n r g a c t l f b k d f w i g c h g
` d @ D B F ^ J A S @ O _ ]^AOS@OG_, as gxgjpi`b`gc `d tlg argas fb
systgjs, tlgfry adc
sfbtwargcgvgifpjgdt.7 . _ t u c g d t s w ` i i c g j f d s t r a t g a n ` i ` t y t f o
f d c u o t a r g s g a r o l f r a p p i ` g c @DBF^JAS@O_ ]^AOS@OG_
prfegot, rgqu`r`dh wr`t`dh adc prgsgdtat`fd sk`iiswl`ol gxgjpi`by solfiariy styig
`d @DBF^JAS@O_ ]^AOS@OG_.
7
]^F]F_GC _P_SGJ
Sfcay fdg oaddft abbfrc tf rgiy fd tlg baii`nig lujad ng`dhs fb ng
r g a i i y wadts tf stadc aha`dst tfcay‐s jgro`igss ofjpgt`t`fd wlgrg dft tf w`sg
say`dh
’tfgrr `s lujad‚
df ifdhgr vai`c, `t‐s futcatgc tf rat`fdai`zg yfur j`stakg. _f, tf kggppaog w`tl t`jg, tf
nr`dh anfut tlg ngst rgsuit w`tlfut jaibudot`fd`dh adc hrgatgr gbb`o`gdoy sf tf
rgpiaog tlg udgdc`dh lgaps fb bi`gs w`tl a juol sfpl`st`oatgc larcc`sk fb tlg ofjputgr.Fdg
las tf usg tlg cata jadahgjgdt sfbtwarg. _fbtwarg las nggd ad asogdt`d atfj`zat`fd
var`fus frhad`sat`fds. Jady sfbtwarg prfcuots wfrk`dh arg dfw `d jarkgts, wl`ol
lavg lgipgc `d jak`dh tlg frhad`zat`fds wfrk gas`gr adc gbb`o`gdtiy.Cata jadahgjgdt
`d`t`aiiy lac tf ja`dta`d a ift fb igchgrs adc a ift fb papgr wfrklas tf ng cfdg
nut dfw sfbtwarg prfcuot fd tl`s frhad`zat`fd las jacg tlg`r wfrk bastgr adc
gas`gr. Dfw fdiy tl`s sfbtwarg las tf ng ifacgc fd tlg ofjputgr adc wfrkoad ng cfdg.Sl`s
prgvgdts a ift fb t`jg adc jfdgy. Slg wfrk ngofjgs buiiy autfjatgc a d c a d y
`dbfrjat`fd rgharc`dh tlg frhad`zat`fd oad ng fnta`dgc ny oi`ok`dh
tlgn u t t f d . J f r g f v g r , d f w ` t ‐ s a d a h g f b o f j p u t g r s f b a d c
a u t f j a t ` d h s u o l a d frhad`zat`fd h`vgs tlg ngttgr iffk.
2
_P_SGJ CGRGIF]JGDS I@BG OPOIG (_CIO)
Slg systgjs cgvgifpjgdt i`bg oyoig `s a prfegot jadahgjgdt tgold`qug tlatc`v`cgs
ofjpigx prfegots `dtf sjaiigr, jfrg gas`iy jadahgc sghjgdts fr plasgs. _ghjgdt`dh
prfegots aiifws jadahgrs tf vgr`by tlg suoogssbui ofjpigt`fd fb prfegotplasgs ngbfrg
aiifoat`dh rgsfurogs tf sunsgqugdt plasgs._fbtwarg cgvgifpjgdt prfegots typ`oaiiy
`doiucg `d`t`at`fd, piadd`dh,
cgs`hd,c g v g i f p j g d t , t g s t ` d h , ` j p i g j g d t a t ` f d , a d c j a ` d t g d a d o g p l a s g s .
L f w g v g r , t l g plasgs jay ng c`v`cgc c`bbgrgdtiy cgpgdc`dh fd tlg frhad`zat`fd
`dvfivgc.B f r g x a j p i g , ` d ` t ` a i p r f e g o t a o t ` v ` t ` g s j ` h l t n g c g s ` h d a t
g c a s r g q u g s t , rgqu`rgjgdts-cgb`d`t`fd, adc piadd`dh plasgs, fr
`d`t`at`fd, ofdogpt-cgvgifpjgdt,a d c p i a d d ` d h p l a s g s . G d c u s g r s f b t l g
s y s t g j u d c g r c g v g i f p j g d t s l f u i c n g `h prfegots aiifws jadahgrs tf vgr`by tlg
suoogssbui ofjpigt`fd fb prfegotplasgs ngbfrg aiifoat`dh rgsfurogs tf sunsgqugdt
pdvfivgc `d rgv`gw`dh tlg futput fb gaol plasg tf gdsurg tlg systgj `s ng`dh nu`it
tfcgi`vgr tlg dggcgc budot`fdai`ty.
8

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O G _ _ F ^ 5 ] G D S @ W J ( A D
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OF^G)@ @ @ . J F S L G ^ N F A ^ C 5 1 . < 3
7 F ^ 0 1 7 , 0 0 7 B F ^ ] G D S @ W J
= ^ J _ @ K0JJ-R R@A K<J<==+<>?8^ ]IW_OL@]_GS BF^ AJC
ASLAIFD@ R . ^
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3 = H N F ^ A N F
R G R@. OC/CRC r/w juit` cr`vg ofjnf5 (@b
naok up rgqu`rgc)R @ @ . B I F ] ] P C ^ @ R G 1 .
3 3 J N 5 ( @ b N a o k u p r g q u ` r g c ) R@@@.
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BIFX OLA^S
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_FW^OG OFCG

0
pytlfd-Jysqi ofddgodh
sfbwarg ifh`d w`tl usgrdajg &passwfrc
ask usgr tf gdtgr l`s olf`og

yfur dggc w`ii ng uiiigc ny pytlfd


ny` d t g r  a o ` d w ` t l j s i
_furog Ofcg5
`jpfrt jysqi.ofddgotfr as
sqiofdd:sqi.ofddgot(lfst:'ifoailfst',usgr:'rfft',passwc:'jadahgr',catanasg:'hrfogry
Vslfp')`b ofdd.`sVofddgotgc()5 pr`dt('suoogssbuiiy ofddgotgc')o:ofdd.oursfr() p
r`dt('hrfogry slfp jadahgjgdt
systgj') pr`dt('1.ifh`d') pr`dt('>.gx`t')olf`og:`dt(`dput('gdtgr yfur olf`og5'))`b
olf`og::15 usgrVdajg:`dput('gdtgr yfur usgr dajg:') passwfrc:`dput('gdtgr yfur p
asswfrc:') wl`ig usgrVdajg::'d`t`d' adc passwfrc::'d`t`d1>?'5 pr`dt('ofddgotgc su
oogssbuiiy') pr`dt('hrfogry
slfp') pr`dt('1.oustfjgr cgta`is') pr`dt('>.prfcuot cgta`is') pr`dt('?.wfrkgr cgta`is')
pr`dt('3.sgg aii oustfjgr cgta`is') pr`dt('7.sgg aii prfcuot cgta`is') pr`dt('2.sgg aii
wfrkgr cgta`is') pr`dt('8.sgg fdg oustfjgr cgta`is') pr`dt('<.sgg fdg prfcuot cgta`i
s') pr`dt('0.sgg fdg wfrkgr cgta`is') pr`dt('1=.stfoks') pr`dt('11.p`g olart bfr avai`n
`i`ty fb stfok') olf`og:`dt(`dput('gdtgr tlg olf`og'))
1=

`b olf`og::15 oustVdajg:`dput('gdtgr yfur dajg:') plfdgVdf:`dt(`dput('gdtgr yfur p


lfdg dujngr:')) ofst:bifat(`dput('gdtgr yfur ofst:')) sqiV`dsgrt:"`dsgrt `dtf oustfjgr
Vcgta`isvaiugs("+str(plfdgVdf)+",'"+(oustVdajg)+"',"+str(ofst)+")" o.gxgoutg(sq
iV`dsgrt) ofdd.ofjj`t() pr`dt('cata `s upcatgc') gi`b olf`og::>5 prfcuotVdajg:`dput('
gdtgr prfcuot dajg:') prfcuotVofst:bifat(`dput('gdtgr tlg ofst:')) sqiV`dsgrt:"`dsgr
t `dtf prfcuotVcgta`isvaiugs(""'"+(prfcuotVdajg)+"',"+str(prfcuotVofst)+")" o.gx
goutg(sqiV`dsgrt) ofdd.ofjj`t() pr`dt('cata `s upcatgc') gi`b olf`og::?5 wfrkgrVdaj
g:`dput('gdtgr yfur dajg:') wfrkgrVwfrk:`dput('gdtgr yfur wfrk:') wfrkgrVahg:`dt(`
dput('gdtgr yfur ahg:')) wfrkgrVsaiary:bifat(`dput('gdtgr yfur saiary:')) plfdgVdf :
`dt(`dput('gdtgr yfur plfdg dujngr:')) sqiV`dsgrt:"`dsgrt `dtf wfrkgrVcgta`is vaiu
gs(""'"+(wfrkgrVdajg)+"'," "'"+(wfrkgrVwfrk)+"',"+str(wfrkgrVahg)
+","+str(wfrkgrVsaiary)+","+str(plfdgVdf)+ ")" o.gxgoutg(sqiV`dsgrt) ofdd.ofjj`t(
) pr`dt('cata `s upcatgc')
11

gi`b olf`og::35 t:ofdd.oursfr() t.gxgoutg('sgigot*brfj oustfjgrVcgta`is') rgofrc:t.b


gtolaii() bfr ` `d rgofrc5 pr`dt(`) gi`b
olf`og::75 t:ofdd.oursfr() t.gxgoutg('sgigot*brfj prfcuotVcgta`is') rgofrc:t.bgtolai
i() bfr ` `d rgofrc5 pr`dt(`) gi`b olf`og::25 t:ofdd.oursfr() t.gxgoutg('sgigot*brfj wf
rkgrVcgta`is') rgofrc:t.bgtolaii() bfr ` `d rgofrc5 pr`dt(`) gi`b
olf`og::85 a:`dput('gdtgr yfur dajg') t:'sgigot*brfj oustfjgrVcgta`is wlgrgoustVda
jg:("{}")'.bfrjat(a) o.gxgoutg(t) v:o.bgtolaii() bfr ` `d v5 pr`dt(v) gi`b
olf`og::<5 a:`dput('gdtgr yfur prfcuotVdajg')
1>

t:'sgigot*brfj prfcuotVcgta`is wlgrg prfcuotVdajg:("{}")'.bfrjat(a) o.gxgoutg(t) v:


o.bgtolaii() bfr ` `d v5 pr`dt(v) gi`b
olf`og::05 a:`dput('gdtgr yfur dajg') t:'sgigot*brfj wfrkgrVcgta`is wlgrg wfrkgrVd
ajg:("{}")'.bfrjat(a) o.gxgoutg(t) v:o.bgtolaii() bfr ` `d v5 pr`dt(v) gi`b
olf`og::1=5 pr`dt('******************************************') b:fpgd('tgst.txt','r') cata:
b.rgac() pr`dt(cata) b.oifsg() pr`dt('******************************************') gi`b olf`
og::115 `jpfrt jatpifti`n.pypift as pit `tgjs:
('slfgs','stat`fdary','watol','lfusgusg','bffc `tgjs') avai`n`i`ty:
[172,>==,1=?,>=2,102Z ofifrs:['rgc','ygiifwhrggd','niug','hfic','i`hltofrai'Z pit.p`g(a
vai`n`i`ty,iangis:`tgjs,ofifrs:ofifrs)
1?

pit.t`tig('avai`n`i`ty fb `tgjs `d slfp') pit.slfw() gisg5 pr`dt('wrfdh passwfrc, try ah


a`d ') `b olf`og::>5 gx`t()
FWS]WS
13

17
_furog Ofcg5
`jpfrt jysqi.ofddgotfr as
sqiofdd:sqi.ofddgot(lfst:'ifoailfst',usgr:'rfft',passwc:'jadah
gr'
12
18
Sgst`dh
1<
_fbtwarg Sgst`dh `s ad gjp`r`oai `dvgst`hat`fd ofdcuotg
c t f p r f v ` c g stakglficgrs w`tl `dbfrjat`fd anfut tlg quai`ty fb tlg prfcuot fr sgrv`og
udcgr tgst[1Z, w`tl rgspgot tf tlg ofdtgxt `d wl`ol `t `s `dtgdcgc tf fpgratg. _fbtwarg
Sgst`dh aisfprfv`cgs ad fnegot`vg, `dcgpgdcgdt v`gw fb tlg sfbtwarg tf aiifw
tlg nus`dgss
tfa p p r g o ` a t g a d c u d c g r s t a d c t l g r ` s k s a t ` j p i g j g d t a t ` f d f b t l g
s f b t w a r g . S g s t tgold`qugs `doiucg, nut arg dft i`j`tgc tf, tlg prfogss fb
gxgout`dh a prfhraj fr appi`oat`fd w`tl tlg `dtgdt fb b`dc`dh sfbtwarg nuhs. @t oad
aisf ng statgc as tlg prfogss fb vai`cat`dh adc vgr`by`dh tlat a
sfbtwargprfhraj/appi`oat`fd/prfcuot jggts tlg nus`dgss adc tgold`oai rgqu`rgj
gdts tlath u ` c g c ` t s c g s ` h d a d c c g v g i f p j g d t , s f t l a t ` t w f r k s a s
g x p g o t g c a d c o a d n g `jpigjgdtgc w`tl tlg sajg olaraotgr`st`os. _fbtwarg
Sgst`dh, cgpgdc`dh fd tlgt g s t ` d h j g t l f c g j p i f y g c , o a d n g ` j p i g j g d t g c a t
a d y t ` j g ` d t l g c g v g i f p j g d t prfogss, lfwgvgr tlg jfst tgst gbbfrt `s gjpifygc abtgr tlg
rgqu`rgjgdts lavg nggdcgb`dgc adc ofc`dh prfogss las nggd ofjpigtgc..
10

>=

N@NI@FH^A]LP
1.@DBF^JAS@O_ ]^AOS@OG_ X`tl ]ytlfd - Oias
s \ @ @ N y 5 _ u j ` t a Arfra
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Xgns`tg5
lttps5//www.w?rgsfurog.ofj
***
>1

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