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Commit 59e24a4c authored by SHIVAM SOOD's avatar SHIVAM SOOD
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Material for lab

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labs/lab2/col1 0 → 100644
View file @ 59e24a4c
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\ No newline at end of file
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View file @ 59e24a4c
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N
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Y
G
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Y
N
B
N
O
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I
Q
O
Y
S
N
N
A
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L
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U
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M
M
Y
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Y
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O
H
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N
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I
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I
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X
N
\ No newline at end of file
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Y
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X
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O
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O
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C
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Y
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labs/lab2/col6 0 → 100644
View file @ 59e24a4c
A
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\ No newline at end of file
labs/lab2/interval.txt 0 → 100755
View file @ 59e24a4c
TNA
396
FEN
323
CDM
816
MKB
1188
KBX
588
XFS
1319
SOJ
342
WHO
1296
HOF
1296
OFU
112
FUI
1296
UIS
1296
BEX
72
NFI
72
MAY
534
YSS
198
YIJ
594
NPW
1266
FRH
162
RHW
1074
VWT
927
UYU
390
YUM
390
SGV
342
VXF
1247
YXP
786
XPI
570
AUN
618
UNF
342
FIY
960
HHG
791
GVI
288
NAU
168
AUL
240
ZFO
24
FOF
754
OFU
1184
FUQ
663
GXC
1116
XCF
1026
ZFO
18
FOK
18
FUF
156
UFE
156
ZFO
1032
NZB
504
ZBK
504
SHO
744
PNA
690
NAY
690
AYT
960
YTF
18
UYY
972
YYK
594
YKY
216
YTF
942
RHR
492
CFU
960
FUY
234
YCL
938
TVG
471
GUF
711
BES
696
WYS
900
WLB
72
LBY
72
BYF
72
YFE
72
EFZ
257
VUW
96
UWT
96
WTR
96
TRL
96
IZG
462
BMS
402
KBT
126
BTN
126
MYM
996
OBJ
288
WTJ
693
JNA
156
NAU
72
AUF
156
FIZ
834
IZM
342
LIV
678
VKO
614
KOL
614
WTR
930
LMB
678
MBA
618
BAT
258
ATZ
870
FPK
636
KNA
864
NAU
84
AUL
864
CIO
240
IOY
240
DRY
114
RYL
114
YLU
114
LUJ
114
UJM
114
VMU
180
MUK
154
KBT
360
BTN
360
MFP
102
FPX
102
PXX
102
XXJ
827
FYU
714
YUW
714
UMB
240
MBW
840
YKY
378
MCG
236
YSM
750
SMC
768
UNF
276
JNA
498
NAU
780
AUF
536
FUY
726
WSF
462
SFJ
462
FJU
462
JUK
462
UFF
516
PWB
686
PXX
408
GFL
744
FLA
522
LAC
522
TWI
84
WIK
84
WBK
534
KIV
132
SYC
288
YCF
288
MAY
168
UFV
364
ATC
24
BAN
192
WIK
174
IKB
174
KBA
174
BAT
360
CIO
636
IOY
636
ZHL
6
PLL
12
YIJ
78
IJI
78
JIZ
78
IZM
444
EVU
312
VUM
312
UMB
312
XPI
216
BBM
168
MCG
288
CGO
288
NZB
240
SYT
66
AYJ
336
YJF
336
KBT
444
LFW
482
WHG
366
MIY
370
KBA
292
PWZ
246
WZX
246
ZXH
246
QAI
312
YYK
210
YKY
210
BBM
336
ZGS
198
BSW
36
SWV
36
WVC
36
VCH
36
CHZ
36
HZX
36
ZXF
36
XFE
36
FEX
36
EXX
36
XXX
36
XXA
36
NAY
66
ZXF
168
FEX
38
NAY
204
ACK
30
MBA
252
BAT
252
ACK
42
FLM
228
LMB
228
ZGS
6
ZGS
234
IZM
48
SUY
105
MBW
18
WHOF
1296
HOFU
1296
OFUI
1296
FUIS
1296
UYUM
390
YXPI
786
AUNF
618
NAUL
240
ZFOK
18
FUFE
156
NZBK
504
PNAY
690
NAYT
960
AYTF
960
YYKY
594
CFUY
960
WLBY
72
LBYF
72
BYFE
72
VUWT
96
UWTR
96
WTRL
96
KBTN
126
JNAU
156
NAUF
156
FIZM
834
VKOL
614
MBAT
618
BATZ
870
KNAU
864
NAUL
864
CIOY
240
DRYL
114
RYLU
114
YLUJ
114
LUJM
114
KBTN
360
MFPX
102
FPXX
102
FYUW
714
WSFJ
462
SFJU
462
FJUK
462
FLAC
522
TWIK
84
SYCF
288
WIKB
174
IKBA
174
CIOY
636
YIJI
78
IJIZ
78
EVUM
312
VUMB
312
MCGO
288
AYJF
336
PWZX
246
WZXH
246
YYKY
210
BSWV
36
SWVC
36
WVCH
36
VCHZ
36
CHZX
36
HZXF
36
ZXFE
36
XFEX
36
FEXX
36
EXXX
36
XXXA
36
MBAT
252
FLMB
228
WHOFU
1296
HOFUI
1296
OFUIS
1296
NAYTF
960
WLBYF
72
LBYFE
72
VUWTR
96
UWTRL
96
JNAUF
156
MBATZ
870
KNAUL
864
DRYLU
114
RYLUJ
114
YLUJM
114
MFPXX
102
WSFJU
462
SFJUK
462
WIKBA
174
YIJIZ
78
EVUMB
312
PWZXH
246
BSWVC
36
SWVCH
36
WVCHZ
36
VCHZX
36
CHZXF
36
HZXFE
36
ZXFEX
36
XFEXX
36
FEXXX
36
EXXXA
36
WHOFUI
1296
HOFUIS
1296
WLBYFE
72
VUWTRL
96
DRYLUJ
114
RYLUJM
114
WSFJUK
462
BSWVCH
36
SWVCHZ
36
WVCHZX
36
VCHZXF
36
CHZXFE
36
HZXFEX
36
ZXFEXX
36
XFEXXX
36
FEXXXA
36
WHOFUIS
1296
DRYLUJM
114
BSWVCHZ
36
SWVCHZX
36
WVCHZXF
36
VCHZXFE
36
CHZXFEX
36
HZXFEXX
36
ZXFEXXX
36
XFEXXXA
36
BSWVCHZX
36
SWVCHZXF
36
WVCHZXFE
36
VCHZXFEX
36
CHZXFEXX
36
HZXFEXXX
36
ZXFEXXXA
36
BSWVCHZXF
36
SWVCHZXFE
36
WVCHZXFEX
36
VCHZXFEXX
36
CHZXFEXXX
36
HZXFEXXXA
36
BSWVCHZXFE
36
SWVCHZXFEX
36
WVCHZXFEXX
36
VCHZXFEXXX
36
CHZXFEXXXA
36
BSWVCHZXFEX
36
SWVCHZXFEXX
36
WVCHZXFEXXX
36
VCHZXFEXXXA
36
BSWVCHZXFEXX
36
SWVCHZXFEXXX
36
WVCHZXFEXXXA
36
BSWVCHZXFEXXX
36
SWVCHZXFEXXXA
36
BSWVCHZXFEXXXA
36
labs/lab2/mogambo-cols.txt 0 → 100644
View file @ 59e24a4c
CVJTNA
FENMCD
MKBXFS
TKLHGS
OJWHOF
UISFYF
BEXEIN
FIMAYS
SDYYIJ
NPWTOK
FRHWVW
TZFXHL
UYUMSG
VDURBW
BIVXFA
FMYFYX
PIGBHW
IFHHOJ
BEXAUN
FIYLJW
DKNHGA
OVBHHG
VINAUL
ZFOFUQ
CVFBYN
FTYGMM
SVGXCF
ZFOKQA
TUIFUF
ERQTEW
ZFOKMW
OJYLNZ
BKSHOE
BPNAYT
FKNXLB
VUAXCX
UYYKYT
FRHRCF
UYCLUK
TVGUFQ
BESWYS
SWLBYF
EFZVUW
TRLLNG
IZGBMS
ZKBTNT
SLNNMD
PMYMIU
BVMTLO
BJHHFW
TJNAUF
IZMBZL
IVHMBS
UWLBYF
EUYFUF
ENBRVJ
VKOLLG
TVUZUA
OJNVUW
TRLMBA
TZMFSS
OJQXLF
PKNAUL
JCIOYV
DRYLUJ
MVMLVM
UKBTNA
MFPXXJ
PDYFIJ
FYUWSG
VIUMBW
STUXMS
SNYKYD
JMCGAS
OUXBYS
MCMEUN
FJNAUF
UYUMWS
FJUKQW
SVXXUV
UFFBPW
BCFYLW
FDYGUK
DRYLUJ
MFPXXE
FZQXYH
GFLACE
BJBXQS
TWIKNM
ORNXCJ
FAIBWW
BKCMUK
IVQTMN
BCCTHL
JYIGIM
SYCFVM
URMAYO
BJUFVA
UZINMA
TCYPBA
NKBXLW
JJNXUJ
TWIKBA
TCIOYB
PPZHLZ
JJZHLL
VEYAIF
PLLYIJ
IZMOUD
PLLTHV
EVUMBX
PIBBMS
NSCMCG
ONBHCK
IVLXMG
CRMXNZ
BKQHOD
ESYTVG
OUGTHA
GRHRMH
FREYIJ
IZGAUN
FZIYZW
OUYWQZ
PZMAYJ
FJIKOV
FKBTNO
PLFWHG
USYTLG
NRHBZS
OPMIYS
LWIKBA
NYUOYA
PWZXHV
FUQAIA
TYYKYK
PMCEYL
IRNPCD
MEIMFG
WVBBMU
PLHMLQ
JWUGSK
QVUDZG
SYCFBS
WVCHZX
FEXXXA
QROLYX
PIUKYH
MPNAYF
OFHXBS
WVCHZX
FEXXXA
IRPXXG
OVHHGG
SVNHWS
FJUKNZ
BESHOK
IRFEXG
UFVKOL
VJNAYI
VVMMCG
OFZACK
EVUMBA
TVHKID
MVXBHL
IVWTJA
UFFACK
HCIKSF
PKYQNW
OLUMYV
XYYKYA
OYYPUK
XFLMBQ
OFLACK
PWZXHU
FJYGZG
STYWZG
SNBBWZ
IVMNZX
FIYWXW
BKBAYJ
FTIFYK
IZMUIV
ZDINLF
FUVRGS
SBUGNG
OPQAIL
IFOZBZ
FYUWHG
IRHWCF
IZMWYS
UYMAUD
MIYVYA
WVNAYT
FEYYCL
PWBBMV
ZZHZUH
MRWXCF
UYYVIE
NFHPYS
MKBTMO
IZWAIX
ZFOLBS
MCHHNO
JKBMBA
TZXXJS
SKNAUL
BJCLFW
XDSUYK
UCIOYJ
GFLMBW
HFIWIX
SFGXCZ
BMYMBW
TRGXXS
HXYKZG
SDSLYD
GNBXHA
UJBTFD
QCYTMW
NPWHOF
UISMIF
FVXFSV
FRNA
\ No newline at end of file
labs/lab2/mogambo.txt 0 → 100755
View file @ 59e24a4c
CVJTNAFENMCDMKBXFSTKLHGSOJWHOFUISFYFBEXEINFIMAYSSDYYIJNPWTOKFRHWVWTZFXHLUYUMSGVDURBWBIVXFAFMYFYXPIGBHWIFHHOJBEXAUNFIYLJWDKNHGAOVBHHGVINAULZFOFUQCVFBYNFTYGMMSVGXCFZFOKQATUIFUFERQTEWZFOKMWOJYLNZBKSHOEBPNAYTFKNXLBVUAXCXUYYKYTFRHRCFUYCLUKTVGUFQBESWYSSWLBYFEFZVUWTRLLNGIZGBMSZKBTNTSLNNMDPMYMIUBVMTLOBJHHFWTJNAUFIZMBZLIVHMBSUWLBYFEUYFUFENBRVJVKOLLGTVUZUAOJNVUWTRLMBATZMFSSOJQXLFPKNAULJCIOYVDRYLUJMVMLVMUKBTNAMFPXXJPDYFIJFYUWSGVIUMBWSTUXMSSNYKYDJMCGASOUXBYSMCMEUNFJNAUFUYUMWSFJUKQWSVXXUVUFFBPWBCFYLWFDYGUKDRYLUJMFPXXEFZQXYHGFLACEBJBXQSTWIKNMORNXCJFAIBWWBKCMUKIVQTMNBCCTHLJYIGIMSYCFVMURMAYOBJUFVAUZINMATCYPBANKBXLWJJNXUJTWIKBATCIOYBPPZHLZJJZHLLVEYAIFPLLYIJIZMOUDPLLTHVEVUMBXPIBBMSNSCMCGONBHCKIVLXMGCRMXNZBKQHODESYTVGOUGTHAGRHRMHFREYIJIZGAUNFZIYZWOUYWQZPZMAYJFJIKOVFKBTNOPLFWHGUSYTLGNRHBZSOPMIYSLWIKBANYUOYAPWZXHVFUQAIATYYKYKPMCEYLIRNPCDMEIMFGWVBBMUPLHMLQJWUGSKQVUDZGSYCFBSWVCHZXFEXXXAQROLYXPIUKYHMPNAYFOFHXBSWVCHZXFEXXXAIRPXXGOVHHGGSVNHWSFJUKNZBESHOKIRFEXGUFVKOLVJNAYIVVMMCGOFZACKEVUMBATVHKIDMVXBHLIVWTJAUFFACKHCIKSFPKYQNWOLUMYVXYYKYAOYYPUKXFLMBQOFLACKPWZXHUFJYGZGSTYWZGSNBBWZIVMNZXFIYWXWBKBAYJFTIFYKIZMUIVZDINLFFUVRGSSBUGNGOPQAILIFOZBZFYUWHGIRHWCFIZMWYSUYMAUDMIYVYAWVNAYTFEYYCLPWBBMVZZHZUHMRWXCFUYYVIENFHPYSMKBTMOIZWAIXZFOLBSMCHHNOJKBMBATZXXJSSKNAULBJCLFWXDSUYKUCIOYJGFLMBWHFIWIXSFGXCZBMYMBWTRGXXSHXYKZGSDSLYDGNBXHAUJBTFDQCYTMWNPWHOFUISMIFFVXFSVFRNA
\ No newline at end of file
labs/lab2/shifter.cpp 0 → 100644
View file @ 59e24a4c
#include <cstdio>
char shift(char c, int step){
char result = c + step;
if(result >= 'A' && result <= 'Z') return result;
else return
}
int main(){
FILE *fptr;
if ((fptr = fopen("solution-cols", "r")) == NULL) return 1;
char word[6];
printf("Column, step size: ");
int dist, col;
scanf("%d %d", &col, &dist);
col--;
while(fscanf(fptr, "%c%c%c%c%c%c\n", &word[0], &word[1], &word[2], &word[3], &word[4], &word[5]) != EOF){
printf("%c\n", shift(word[col], dist));
// key_len = gcd(dist, key_len);
}
fclose(fptr);
//printf("%d\n", key_len);
return 0;
}
\ No newline at end of file
labs/lab2/solution-plaintext 0 → 100644
View file @ 59e24a4c
BEPATIENTTILLTHELASTROMANSCOUNTRYMENANDLOVERSHEARMEFORMYCAUSEANDBESILENTTHATYOUMAYHEARBELIEVEMEFORMINEHONOURANDHAVERESPECTTOMINEHONOURTHATYOUMAYBELIEVECENSUREMEINYOURWISDOMANDAWAKEYOURSENSESTHATYOUMAYTHEBETTERJUDGEIFTHEREBEANYINTHISASSEMBLYANYDEARFRIENDOFCAESARSTOHIMISAYTHATBRUTUSLOVETOCAESARWASNOLESSTHANHISIFTHENTHATFRIENDDEMANDWHYBRUTUSROSEAGAINSTCAESARTHISISMYANSWERNOTTHATILOVEDCAESARLESSBUTTHATILOVEDROMEMOREHADYOURATHERCAESARWERELIVINGANDDIEALLSLAVESTHANTHATCAESARWEREDEADTOLIVEALLFREEMENASCAESARLOVEDMEIWEEPFORHIMASHEWASFORTUNATEIREJOICEATITASHEWASVALIANTIHONOURHIMBUTASHEWASAMBITIOUSISLEWHIMTHEREISTEARSFORHISLOVEJOYFORHISFORTUNEHONOURFORHISVALOURANDDEATHFORHISAMBITIONWHOISHERESOBASETHATWOULDBEABONDMANIFANYSPEAKFORHIMHAVEIOFFENDEDWHOISHERESORUDETHATWOULDNOTBEAROMANIFANYSPEAKFORHIMHAVEIOFFENDEDWHOISHERESOVILETHATWILLNOTLOVEHISCOUNTRYIFANYSPEAKFORHIMHAVEIOFFENDEDIPAUSEFORAREPLYTHENNONEHAVEIOFFENDEDIHAVEDONENOMORETOCAESARTHANYOUSHALLDOTOBRUTUSTHEQUESTIONOFHISDEATHISENROLLEDINTHECAPITOLHISGLORYNOTEXTENUATEDWHEREINHEWASWORTHYNORHISOFFENCESENFORCEDFORWHICHHESUFFEREDDEATHHERECOMESHISBODYMOURNEDBYMARKANTONYWHOTHOUGHHEHADNOHANDINHISDEATHSHALLRECEIVETHEBENEFITOFHISDYINGAPLACEINTHECOMMONWEALTHASWHICHOFYOUSHALLNOTWITHTHISIDEPARTTHATASISLEWMYBESTLOVERFORTHEGOODOFROMEIHAVETHESAMEDAGGERFORMYSELFWHENITSHALLPLEASEMYCOUNTRYTONEEDMYDEATH
\ No newline at end of file
labs/lab2/vignere.cpp 0 → 100755
View file @ 59e24a4c
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main(int argc, char *argv[]){
char key[20], type, input[2048], output[2048];
scanf("%c\n%s\n%s",&type, key, input);
int key_len = strlen(key);
if(type == 'e'){
int i = 0, j = 0;
for(; input[i]!= '\0'; i++){
output[i] = input[i] + key[j++ % key_len] - 'A';
if (output[i] > 'Z')
output[i] = output[i] - 'Z' - 1 + 'A';
}
output[i] = '\0';
}
else if(type == 'd'){
int i = 0, j = 0;
for(; input[i]!= '\0'; i++){
output[i] = input[i] - key[j++ % key_len] + 'A';
if (output[i] < 'A')
output[i] = 'Z' - ('A' - output[i] - 1);
}
output[i] = '\0';
}
printf("%s\n", output);
return 0;
}
labs/lab3/cipher190-aes-128-cbc-16IV.bin 0 → 100644
View file @ 59e24a4c
6w7ჼCOX : F)缪JUR[ J!y6V.ݷ* {5q%7O k 4\u  hSʂawu"1Ms+3^`>N+3N*^42 w}`Sop/B61l
\ No newline at end of file
labs/lab3/cipher32-aes-128-cbc-16IV.bin 0 → 100644
View file @ 59e24a4c
6w7ჼCOX ]NT?J]]mdesy<jV!ţ
\ No newline at end of file
labs/lab3/cipher_128.bin 0 → 100644
View file @ 59e24a4c
6w7ჼCOX : F)缪JUR[ J!y6V.ݷ* {5q%7O k 4\u  hSʂawu"1Ms+3^`>N+3N*^42 w}`Sop/B61l
\ No newline at end of file
labs/lab3/cipher_190-cbc.bin 0 → 100644
View file @ 59e24a4c
6w7ჼCOX : F)缪JUR[ J!y6V.ݷ* {5q%7O k 4\u  hSʂawu"1Ms+3^`>N+3N*^42 w}`Sop/B61l
\ No newline at end of file
labs/lab3/cipher_190-cfb.bin 0 → 100644
View file @ 59e24a4c
闬%L"dT3 {ٱꍇ|텉a<'>z5f6sϔN_%/t5hݍ84BS#]^A lF7!D ~ϫyKD/ޢp`Im$GM&;d6rLSNY0}pȃK4n0989kܭ$
\ No newline at end of file
labs/lab3/cipher_190-ofb.bin 0 → 100644
View file @ 59e24a4c
闬%L"dTf6j{o>j[^VQ\hg&\
=WFS"I!fDJ_wQ~ы%`RUKjŏTX+lQ$D3ߗ-la)? /3fv:hk+Х{xɵF<G*
aܒт;x
\ No newline at end of file
labs/lab3/cipher_32-cbc.bin 0 → 100644
View file @ 59e24a4c
6w7ჼCOX ]NT?J]]mdesy<jV!ţ
\ No newline at end of file
labs/lab3/cipher_32-cfb.bin 0 → 100644
View file @ 59e24a4c
闬%L"dT3 {ٱꍇ|
\ No newline at end of file
labs/lab3/cipher_32-des.bin 0 → 100644
View file @ 59e24a4c
"l4FîeaX;c/&fd=:y
\ No newline at end of file
labs/lab3/cipher_32-ecb.bin 0 → 100644
View file @ 59e24a4c
+w)2y4TsO0{sqV-uwyfjy
\ No newline at end of file
labs/lab3/cipher_32-ofb.bin 0 → 100644
View file @ 59e24a4c
闬%L"dTf6j{o>j[2
\ No newline at end of file
labs/lab3/original-aes-128-ecb.bin 0 → 100644
View file @ 59e24a4c
This source diff could not be displayed because it is too large. You can view the blob instead.
labs/lab3/plain_190.txt 0 → 100644
View file @ 59e24a4c
12384928824892899221319247819274738749723974728937472398472837429837482374928374982739847982374923748729374823794282378947239847982374982379847239847982374892734798374892738794327894723894z
labs/lab3/plain_32.txt 0 → 100644
View file @ 59e24a4c
123849288248928992213192478192z
labs/lab4/plain-no (copy).txt 0 → 100644
View file @ 59e24a4c
Nn
\ No newline at end of file
labs/lab4/plain-no.txt 0 → 100644
View file @ 59e24a4c
No
\ No newline at end of file
labs/lab4/plain-yes (copy).txt 0 → 100644
View file @ 59e24a4c
Yer
\ No newline at end of file
labs/lab4/plain-yes.txt 0 → 100644
View file @ 59e24a4c
Yes
\ No newline at end of file
labs/lab4/plain1-2kb (copy).txt 0 → 100644
View file @ 59e24a4c
Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information. Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information.
\ No newline at end of file
labs/lab4/plain1-2kb-cbc.txt 0 → 100644
View file @ 59e24a4c
¾Ç|‚P!û1¡xæÙÁ©ate a text fild that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information. Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information.
\ No newline at end of file
labs/lab4/plain1-2kb-cfb.txt 0 → 100644
View file @ 59e24a4c
Guidance: 1. Create a text file that is at ldastÒ专œ5Þ5Õ;YåÌ_. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information. Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information.
\ No newline at end of file
labs/lab4/plain1-2kb.txt 0 → 100644
View file @ 59e24a4c
Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information. Guidance: 1. Create a text file that is at least 1000 bytes long. 2. Encrypt the file using the AES-128 cipher; you will play around with different modes. 3. Corrupt a single bit in say the 55th byte of the cipher text. You can do this via the bless hex editor. To corrupt first bit of a byte in Bless Hex editor, Go to Tools->Bitwise Operations. Select appropriate byte and perform bitwise operations on it. For example: To corrupt first bit in "61" (hex), perform OR with "80". 4. Decrypt the corrupted cipher text file using the correct key and IV and compare with plain text to identify the loss of information.
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labs/lab4/plain_190.txt 0 → 100644
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12384928824892899221319247819274738749723974728937472398472837429837482374928374982739847982374923748729374823794282378947239847982374982379847239847982374892734798374892738794327894723894z
labs/lab4/plain_32.txt 0 → 100644
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123849288248928992213192478192z
labs/lab4/plaintxt-no.bin 0 → 100644
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f}6@IKC
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labs/lab5/doc1.txt 0 → 100644
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Office Order
Permission granted to Agent Z for procument of 100 desktop computers for the organization.
- Gabbar
labs/lab5/doc2.txt 0 → 100644
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permission to Agent Z to enter high-security area
notes
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...@@ -38,3 +38,8 @@ OFB: affects 1 bit in current block ...@@ -38,3 +38,8 @@ OFB: affects 1 bit in current block
For ECB, 1 bit change in cipher text affects the current block in plain text, which is 16 bytes long. For ECB, 1 bit change in cipher text affects the current block in plain text, which is 16 bytes long.
For CBC, 1 bit change in cipher text affects the current block and 1 bit of next block, this results in 17 bytes of corruption. For CBC, 1 bit change in cipher text affects the current block and 1 bit of next block, this results in 17 bytes of corruption.
For OFB, 1 bit change in cipher text affects affects 1 bit in current block, this results in 1 byte of corruption.
ECB - Electronic Code Book. This mode is the simplest, and transforms each block separately. It just needs a key and some data, with no added extras. Unfortunately, identical plain text blocks get encrypted into identical cipher text blocks when encrypted with the same key.
CFB and CBC: Secure when used properly, parallel decryption, but affect multiple blocks in case of errors.
OFB: Even if cipher text is corrupted by a few bits, receiver can get maximum info and at the same time is quite secure.
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