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Season 03 • Episode 15 • Breaking the Vigenère cipher

Breaking the Vigenère cipher

Prerequisites :

Season Episode Time frame

03 15 2 periods

Frequen y analysis - Vigenère ipher.

Objectives : • Understand the weaknesses of the Vigenere Cipher. • Use a software to de ipher a Vigenere ipher. Materials : • Eight dierent iphers, available on paper and as text les from the s hool's server.

1 – Deciphering

55 mins

Working in groups of 4 or 5, students have to de ipher a Vigenère ipher using the instru tions on the website : math.u sd.edu/ rypto/java/EARLYCIPHERS/Vigenere.html Plain texts must then be pun tuated and paragraphed and then sent ba k to the tea her, to be graded.

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 1

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

EBGIQ NYPDP THFSL WVGSL PXJKB DVWDF DMVSJ WUPNN EBGGY EIVRC NNQPL YNJON FHFKQ PHJSK TFHSJ CYQBC ENTOQ MDGMR PHJKK LWKXE WYICY PLUMY DFKNM EGCXY PZCBC DJKMG YCVGY XBGDS YXUKU

LSVRY LNGCY PPKDY LVQNW MYGXL PQCCL WJQCQ LLVSA DUNPP DCVEY ZNDOG CIUZC EIPOG QCXOU PZQBR WMGDF DCVGY ZZJSQ XYTOB EBGGY RUKXQ FAJDD FNYSR RYFDM YXYKQ ZOUVW DMJSL CHGNF DYXOP

ENJON XUPCK MFAMM EBCDG LGGNK ZNIYG TVNOZ FFCBJ PXUZY ECQXY YAJKL NNQPP YBKCA PYMCY FHCDC PSYYS DUNKP LNVOL THVYG WFIBG ENJOQ TLGKL SUHKG PUUOG LHQDF DNTYL JUURC TMJOY LFQPR

CIUZC THFGM YWGXR DAQSL ZCUDT YAVYC JVGSL JIPDF YANOP YXJKB RYFSL PGQFG PFNGY YXTOB WSPYM WXJKT RYCXB ECQXQ EUUKL AJGNR EIPOQ OUTOB YNCXB EUYKW PLDVM RUPND DNWNG ONGXB SYYKP

NNQPZ YXGBD CUVOQ RNQLC ZHNSN XVCBP RBWXE LNDSR LHFRC NIPMC EBGWM YACVJ WFYSR FWGNR YYGFC PXKCA SYCFW LHFKR LHERM SYKBM ZHGSR XCUDD THCZN QLQWR NECXB CYURH PXKDF ZHUDU OYPCU

PCPQF FFNIS ZHKCR SUPQC HCILW LMUDF FHFOP ZZKDI EIQUY YNTKR CHKXE EBGMP SUUZM SYUZM CWCWC ZPGBC DNQXC DIOON CZQBK YLKXE SYTCG TFNOB CIRBG SYJYJ EBGWM FMVSL PBGKP LHISL LNERG

LHIOB YZQBR SUVSL ONJOK OIVSL PHCWC TNVYR YIYXY XITON PXJSQ LHFWM FGDVG ZHUYD ZHVYQ EIERY ONJOU EBCDU ZCPDY LHCMJ THDYR OYCXB SCUFG LNGDG PUPNN CNCBY QLQXR ONJOA RUNSR YAJSK

THVRC FHCDC EBGWM LHIYG RCHEL THUYD SYYYP DNJOB ZMKDG XCPNM DNRKP YAOYP LLVRC ZGGDF YAGDF ZLNNQ LMEEP SOIOQ PMOYG SBCXB SYCFC DCQXZ YENSL PYTOB CIWXB ZZKDU WURZG EFGBG EBTYS

XITXG WSYRY CHKXE YAVYZ HCUON LLCCR WXKXE PUVRU GYCZN YNJON ECEEJ EUTPP HITUF THIVG PVGNB SYCFG CYPDJ EURVC DNUKR DVTKA OBKCQ FNVRC RHQSQ THUSB TNNYM LMCXC YADOF QZQPY RBVRC

YAEYL ENJOK TNYSJ PBCXE LLGXR SUVGY PHGBY LLTKL CICMF CIUZC LLNIM ZGCBM LXVKI VYCXY THIRC PMVWY JNJOM SUFLC OIYXD PXJSQ SIWVB MFQMI PGQSQ PUVDF VYFCS HMRYM THFRG RIPIY MUTC

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 2

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

HODEB VSHFE ARHTY PNKHR FRRJT RZDUU GNDEN SUGGB ROATY TRVFB YYNFS VJTTY CIXHG VAZWC FHDTY TCCIZ XHGAD GGAIG TNKHR VNGCU VQZKV XLNIG LSJWC VUWTT

TIHVT RZSVB EPZXC MSIUT NWOEH SBICD BITYE ACLFC BRHGA FTHVT OWTUS ELRVO QDATH GZNGV EAWVH PTRKH VVDUW PRRWI KDRCD HZSZS YJVXC VPTGI GPOHA OZSDU

UWCGJ VFFRR BOSOL BPXGJ WIJWN JWUWR LKTRV JNUSJ PEQOC EWTDE REETE KTUSI RGLEI TLRMC KTVAT EIHTR HFFOQ JFVBV UOSSK TTZNT YWNGA RQTGI XGYTT K

YBIRO LPMGL IEDBK OHBSS GPFKE HNEES EISGY SGEEE DNEES OGHDM OAPFS UINGO ENFGI ZXGYT CCIZP BEWRK OBNGI EISYC OCDTD KXTYT EKSSO ICOCD SIYFU

LLQZT RDTOG RAKCU CIXSP EOALR IHVRR FNRGE NFQYR IHVRR RKRZX GCUFZ QLVWB MIAUP RJTRP TRNHL BELWC TSDNZ HTKHR THHFC USSIJ REZTA POHQP EVPNU

AINHD LRDPI HWETL BIIPY NXVBO TDRVP RFBYS NQGJG TDRVP TKLRB CRPJZ FZIEG NUTUS TUWCG SKEIY TFSBT TSZTW WGGII IEGUS TNBIC CIHZN NKBYI AARUO

PDIAV UAGHT VBZOW UACLV IPBFZ HPAIT BAEDG XEFHT ESHSZ DIJEF QEQZX ESPLC CENBR NAFUD GVXNX IMFRG LPVBE CCCTY LAJOJ FBOZT TADRV UFRWN FTBBI

BEIGE NKIBB AYCRK BVIET AJCES SBICD VTRVF DJUPV NTOCD PTLFW KVAAC YJSAL FLACD IEGEW WNGVO OGSYI AEIPV EQFPI WCGKH SKOUW TUOCA ZAHVT HVPVD

NHCIX IOJMN GIPYB BHWEJ PMKHR JWUWR BFTNF IHZNT GEEGD UWBTY KEITH EOJHW SZNEI VHKWU ZNTKG SHTDY XSFTU EPVDT RDDSK HHFLQ COAUU UCJGY TOITU

HGKTR ZASFU OIEGV TESTT GTWVR HZNGI TZWCE GPSJT NRLGV EPCPC FCEUH EFVRF WNGVL WRHNA OEGGV IFKTI SGFFO AEDJV PBBTM CCASR LRTAO TVTNO SZEPM

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 3

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

SIDWI MJNMB ATDAK DAJBN PUHUU TKRJL BMYJN CURKA ROTXI YVVBR IVSZG EYAQU DBYBT VZOAN LEUVV ABCFA CMITG DUNBS AUPPU FNEKT GAITU EO

SEAJJ MWPRK SORLM MIVKI OYBNJ UFURV JTPVH LZOGG PBGBT KRBFU WFEMU UHKIV BIUVT ODBNO YPKCB YTMHV JLUIZ FLOED GRMNJ GFVYU TIXWQ

GNELN HMUJD UPUZI EZRMV TPLOD FXTNE AXDME NGNBY PXOAL HKPQK RVZOG UVSZR EDPMT NBYFP VETNE ARTWK NMMFR VXEBE GMSAZ UZXSA CMDUB

IETHM GNGKI VKPTN TBKEA KRPVB IZSWG FRYSP BIUVT LEUBK UHKFI NEARJ QFVSZ UEJAV OTERT IJTAY IEORJ ZHMCF UVUSG SSGIL IEEZH GKIEC

YFAXD ITGIS EEFOD SVZFE DYOVK SPFUA VEAEO SZOWU AOFPD CMFXO DIHMV RMREL UIEXE ITFIT SQETG IPTNE SYCPR ILMJM KIEYW GYEPJ AGZUH

BYFSI PUZIB KRNLM LZOTN IENOZ TDPVB CEHMG CAIKI ODMRU UKIEY SFALT KRBYF ICJZK UAEOC AITUX ZJXHK OGKDB KSICU QDNEX BIJVQ ONSZP

RMRNB KIETH LGTMJ EJCPS ZAOTT VEAVU NERTT CJTZL OKMXC HMUSO PHOUD VUIKV DBYBT EHWUM AYAER NQKDA YFSOT HUUOY JWTBS DFSLA NIEJI

ATPVG MGVTN QRONO YOUKI PIFAZ JNZHM XEIUJ MNBYG PYGNI UFPRE UFSNO XAYHQ SOAKV IEJTC SEZHI SEBFJ CRUIU JSKEG ZAEZH UFVSL PKKYW

ITIAY IAABC DPRTI EYKGN EVVER FMDIE NMWIK NLCJT BFDLL BXOSV NOPPU XIEXP NASCR AAEUE KXOSE NBEVK NAFNE FVKTO GYHWE AUZMY LSFGT

FDYHI QEBFO VXCIX BSNAH GIVCB AJQIZ FRCET GCQXB IDFAT OTNEK XGZRD QKDHK MLETP TTQIF VNFRK JVKKQ CHIKJ ENIOO PRKDB ONBYF PVSSR

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 4

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

QPWZA MAJMG ICLPV DCNMT TYKXG UHVAQ OYLQO FBSBJ ZQZMP INZQP MNZMU ANZMT FIGSR UNZQP MVGCV AJDMH MVGCV QMEWT MXLWT HYKEJ SMZMF QHLIP QYHMU QMWKT

FBAVI NOLXG TYKBC SYLAV XFAVI YYHWK QIFEJ QLWPG FBWOW SMVQH MQLPK BYGXN UNQWP WNZIV FBSBD ALYWV NFGWF QUUKG QUVBJ AIFBJ NSLPG PYSZN FWSDG QULCT

ENSZV AJDMJ DNGNV AQGZM AZLPG ZNAVV UWZIO DYAAV UFVWH RYJMP ZAKLK QUKBJ TCEJG AHJMH GNABY FBSBV XULMT BNSJN QGLWE QQZWN PYKMT UYJAV EUFLI QMAEK

EMGUG MPWIN TCFOU ALZWY IIJLU TYLEK QNSXJ TYHWK MMKIU FFQNT RZWZG UHYAN OUMAG XYUBK MMECE TYNMT AHLPG QNGKJ TCDLT QUJMS HCFOC UFDEJ XIGUK XFGJU

IBWZG IUQAD FBWGY FBWUC KYLBJ ENAVI ALAKC ZNOPG ECFAG AGGBJ ZNDGH MNWZN TYVTQ AHOMU TYSZN KIDLG KNGWM UFVZG QHJIV GCLMM ZXLPG QHKWO QMLNQ QLNMV

MFLPQ QYFLK AHVMT WYJAQ QLWQU WHGBV XZAVI DYABC ZLGTN QLHMQ DIEWV ALVLQ ENTWV TIMTF UYJMX ENKBQ FBWJN ZIJIV TYJBJ QYFWP ZQGVF QNZQP DYKBU TYE

GAZUC YFQIY MFGCF RXAKV FBWKQ UHYZC QLUIP XFTMI QXEQU BFWIP TYJXG IHWGQ TJSZG TUNMY QHLPC DCWAC AIVWW XYSAV MHLPG NFGWF QLWLY SCFBJ FBGCI

ZSHPA MLWWH TIOBJ UIFIT ZMLIP HYDQP NYHCV MHKWO FYJBG PIFMQ AJDMY RNZMI ZNKIV AHVMT ZNZIV DYKWQ FNGUC FILPG OBATF BLGDK TYJMV QXSZM TNOPC

ECUQU FBWXT QMFWY UYKTQ FXWAK SHWBU FIAVF QNZQP MNAUG RNZMY MMAVU GCDLU MHWIT QXSJK IBWVO ZYJWT WYLPG BYGXN DYFBJ PYVQV TYKBQ ZYKAQ FUJMV

FMVQU AVDMO BFGEF AEMXV DYLWH AZKXC UWSBG SVWOC IBGAC MSKBJ QYAVI MCVEG XSSOG FGGZG AMLXG XULMT ENGZK QQZWJ QGKMN EVWQP DCWAY RNZMF TYQBJ

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 5

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

FOTBR GBXJX QZLPM JVANK BLXLW RUFZW IAVTT BGPVX PJTPI YBAXC ATRUN LVWBA NBTGX LEESX ECYMK JBATX GMWGJ RPBIR VCBMI HIPVG XYJZX XMBLG AXVGJ EJFKD NLXML NWMEL GBFTK MATKI

JYBAX PXEPS XBGJK VFVWM BEXEE LFZLB VXIGW AATRU EEEJB CNDXX TRTVF XCKJT JBIMV WYBGV FWINO JTZMH KBXWN GSFSM KMIML MEBIM TVVXW RWZBX WIEIJ KMXMB VXIVD PBFEE XEUDI KWCXY

WKFZL TBAMY MUYKT MEDQL IBAXW AXCTF STJIG HZTYX LFEPG PJJEA ZVWML EMLVX LVIEB XTTIM AMRVC JKMQG TCEWE LXVZT XLUQW JQGTP FXTVT HZSIE FGAHP MAEKR FVHIN IBAXW LBXNJ SIFOB

TXLWB IYTXT CMUIK VSDUI VJTXI ZKRXY LTVTX VIXTK MMAIG XVVNV VHMGM BHKCF MLDNT EYWTG BWHSI ZSEQG KQMTL CLECS PSLQL CXWKM XEXAY XEKMM UTVBY MTGWY LIKMM RHSHY ZXMSN OIEAI

EXTRX RUJTX BMXGX KTXZA LRSBL JLBLG EXHFS XJTNM QIVXA PHVCI IITNM KWGXT WBRKJ SKMMK FVWML ATTGJ XYFDX JTBXZ GXZVW WFKWM TPTOI KUEXG LVXKT JAVTV NGMMJ GFZZL MQVAX ENIFK

AXLGR ILRSB YJAMT MERWG TVVGG NTZEW BEBZV AIDZT YJZXM AHYXY AIZWP RWBBV ZXLXY PSIQL VSLBW VLBRF YSLSL VXQGM MOXRY AIIYP RQMZX GTGSC KVPNV IDQGZ ZLXGF XAYNK YJZXI BKNI

WZRBR LTVVG VJYPX JIDBR MNVKQ AZYPB TVMAI MBZVW LVNZU JQKHA XTHJB YCFZI ZOXVS PAMTM RFYPB ZBXKW LHQVT LRYAM FDXWM BGKJY RUYPT IUTGX ZMLVJ LZRAX SBTBR AVSEY PPNAP

XKWNK QZZII WMWKM XAMKR MTGHV MWMFA UNAVT AXMLV HHPJI EBPBV PXGKF EEEJB EYQGX ETLME GKRGW GFKXT VXMST HVPGM JHWOX PHNKY MXYJE YJGKX VMBVV EJRSL JJDXK IBGWY XPCFT

ICJXA YPTGT KXRTJ WDFTE QMIAE MEEEI RPRWK DTBOI MLMKX LFWJB IAZXX PASJJ RKBZX FAMKS NMMKG RZSBX TUIEE VTYJJ VVIAE KWKXB AHPVZ VZLPM ZVBOI MAIJF CKMQG NUTGH EMVZG

TRKXW VTXEX JXMAV UYKYP EYAMT AVESL XXYFV FSJTE BXTFL MZVWG KTOXM QGAES VOZSO ETUBV MVTYJ EPZLM ZSBHT IKTGV HSUUM RRXEX VBOII MSFTB IXMBG KDBRJ ZMEHT KMMLT IEFCK

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 6

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

PTLPQ PDYPA LLAPQ VSXIW ACJGG UOUWG OIRWT OAHEJ VUHPZ FTDLY YTJCY ZAKTP DAHJQ HRBAC HVTIF OEBKC OIVWJ NNDIP ZTWPR OEHFS ZETBC UGATG ZHTXR OESRY ETGTK

HMDDL RSDCF IEXCE DAHIF VUHPZ ZBDPR HRXDS HSWHM VUIIF YDIWC AEANR FLDCE BAAAW ZSSXD LFDJJ YYBJA FSZXJ HCTDD AOCXE PDLTP KTDWY UTTGC OEGPL BGWIQ LLNUY

SEHHL LFXHF ZQJXB LCJGG VUIIF AHTNQ ZOUIF TEDUR LSWPP TTWTA OENLC DANIM DEAAU MIRJJ LSIIY OICSC SESRF AHTHO OTPBM LEHEC CEQTC ZTTSC KUHJY PGWIM ZTXCY

PGWIU LDUDP AHTNU VUHIF LLPCR AAGIC LIGCS OEBTT WBPGZ BRXDS YECIT AHXHD VRIWG ATDUG ZTTDD TACSG LFHBY BISLF VNATQ JIPAJ UAILM FEQPJ SLNIF MOCTG ZTGPG

OIRWU JUGXM LRTRS PNVPZ LRCIF KTDQC TBTGQ LNQTA LDIWG ZSFJG LRNVM PSWXL ATWTA UDPCB HNNRP UARTP KELXR HTHDC ZNXVF FCJGG YKDCR STDQC LRTLC AHPSZ NHIAG

HSVDM BSHFS YIDJQ VUIIF HTHDJ JOBTA BDSTL HMTRS UGIWY KWTGC VDPIK NGGDS BRXDS YERZM LAIJP AAXCI OGGTY CEGHM AICIF VUHPZ OEHTY ZETCR YEPUC LECBY UE

KFDGR PDHDA AHPIG LMHWM PDWPB BRXDS SYKPL YIDJQ AWPHA LXIGC HKXCE UDQJR ZSFJG UESQW LICIF PNSDD ACPGC SISYY LSEPU VUITT PTHTJ OEGTU DAIIP RICVR

OEEJP HLATB ZTDHY YTANY OUCVM ZAQDS PSWTB CEGNZ VMXCE TEANA JOCCC MOGHM KWTGC JOCCM LWDGJ YEHIY KIHWC JKHDL UICVQ LRNIF MTWTP LRTCR HCITB ORDJE

WOHTQ IERPS FTWTG MTTGR CEGIF ATWTU ZKNLY YITUJ CEGNO BRXDS JTXDL SISIF CEGNQ PSHTS KTWXQ BRPCR ZCDCR ZPGDZ LAHDL PNVIF LWPHL HNNDR AOIWC OTWTU

VFHDJ ZEPHU YCJGG OENVM LSITP HYXCU YDLXR FCJGG BIRZJ ZUCUM ZIILY LTGXN TAAAF YSIDF TASTR DHTGC HICXL SEBLY DHTCR LCWTD VTPHG OEGUG SIVWR HTTGC

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 7

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

PHPCW WROHZ PHPHZ PHPRG QNETD ENDLL SACOK WSAPU OHZHL ZACVZ NTSPJ OFPWD ACZXW KBPTF IEOLL YOOTD HFEZV CGPOE ENVHW COODG ZSLYV OSESW AGTYK

ESHSW ECSTK KLPHG ZSESJ POZWS HELDL ETXFK POQEZ DETCF KLPDA AARLA KWAWS SIYYW PHPWA PHPXF AGZOL WYDLA WDVTF REWZK NTPXH ZRZFY CAXTF WIOEZ

NEESW WTZYW NLOLF KWOTU PEESS OOTEA PHLGW AMDPD WTFCW JTZLF JMLJT UECDA NSLYV XRLCQ KOYPD DRZFY ZFLEW CSDLA PTSPJ ASEHJ DTDDS CTLMD ALLOQ

COODH WNOEZ ZFLEW ABFEX PHPDT OCWLA XEPYX REDEZ PHPPQ ENQTF AOESW JTSPK OATOA SIESL EKPSS DHTDX WNJZF ZFLEW QLPDX ACVPV EDQLL ATSPY

HAJRS ASLXW WLHLQ WTPAD AEYFK IEOHZ WTPRG AYNLF ASZQX ETJDH NTSTF IURHS WCNFK DEOZM LOZCO WNRDA AFLYU LLPLK KRESS IACTF ATSLL KDDWG

IEDHA PIXPS OWTYK WYDNZ ENREO WTPGW ZSNLF JOENZ WTPLJ ACVWW CSSPT UWTYF ATSPZ XLPSS ENYPJ PSPPE USZXW WNEWQ POYPK ARDJG OAYPS KKPOM

PHESW OIXAD BAEPS ASDLF KQFPW NHLAH PAVPS WNRPA AHLCV ZWTEZ HIYVW ARDOG EGSAJ JDPOS CRFXT OTSLL PHTYY OTLCU WIOMD QAWHS OYZYW LASDS

HIGPK APWLQ HWLJK ZYZFV JSLWD ANDEZ JYQZJ OTSPA HYPJW SHLEE ZTSPE FUDET EEDEG TELYV HEOZX EAXQS ALDPL NODDW ENOTG USHTF WSSLV EDQLL

KFXPF ENRLJ SIYDE KNEQA WLZYY AYDLQ IBFEL NEJPK OAELD WYMPK OMTWW AFZCW BTSPY DEHZF BLPCL ROCTF DERZV ZLZGW YHTPX OATOA KWQPD ALPES

KNLMG AALYV KSEZX JDZFL BAEPO WFEPJ DEZYW SHTNZ HJFDL PACDG ZAESA PHPJT NEPYJ DEMPS DENCG CMJDW OSSCM NSTEZ KFESW KFWZG HANCG CAXPT

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 8

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

NZEGB UYLPV NOEMG TSIWN TFKIV IEJCO LPBSR IRPTY LOMCR QFMEX NTVKQ NJBLV UEWJN HPKVN IDBEA LWALR NOQXJ DOZSC EYWPB VPQXN HPVXU TZQXF TJQWN EOWIF TSMIS LJIRL TZZXB AEQXV IZVSA

NDQHR VTVKP HZCXO BZCXN TSIWF ETVKB AEIRQ ANMWJ STOLG YNZIN ELBLB NRAQN NJBLV GLVHF TXWZR LWESO IWTPR PTVKN NRMVB NOQXG EPIKY DPIXU HLJMG TSQWG FZZXV TSQRT IDMWO SAIVG EOICN

REPIG RPIXH ETVKH SRWSQ UCDMI NEPIJ TSMRG HZAIU KPMRR TFZIU NHQRT LWMVG NRJMT UCDIL MPVXN BWQRT AAIRQ WLGJE NPQRP HTVOF EWMXF EGMVL TSIXV HPZIF NGWPI EWAIV UEWJP INQTN TZZXB

OCBSV RPQXV NOMVV AECVA EOELV HZTIA HPZIV OCQDB NZCKU AWNEZ SEIPB HLVMG GPZEA TSMOV NOBLR AXWRT AXQRH OXQXN HQZSZ WSIXN GZIRQ OYMOA SSIVQ GZWHR EOBLR TDAMZ OFZWR TTVKV IDMAV

SPIRQ STUTB TTBWU OQATR LPBLR OEPVR SEPIR NDOSN TZATB IWMEJ NDIRQ IDIRQ DJMXG NRLSZ NTBAV TSMFH TPTEG NOQXF TSMKE GCMEG AWUSF OHAAU TZALN AEQRT RPAQH PWGXU WSIXG NLDIE LWTIN

TSMIN SDQFY OCQDB EOIWL RPAXB AEBSN ARTIN LWBLR TEPIE AJIPY CWIAF AETIN HPMET SZNXU LWNSP SSMWQ ECBLR EPAXU OFVHO FCQIA TLTAN YEPIG KPWJS OYIXB CSJIG EOMPV HPMET YNZYQ RYPSJ

GWMXU EEWPV NDIVR OFVIR FPDSY NJWRR CCMEG WLGXB UDBPR PZEIE EYWYT SEBEX LPEMY EHWVY UDNSP OHVXU TZZXB EHWVY UENMI DTPEI YDBLR OCBSV NZWRR REWMF TPZIN GSBSS LPLSR EQWVZ TZNPL

EEWVG VPVIN AQMAV DEWLH UEQSA AYLXB UCMSS TSMIQ OQASZ AWTGB HEWQN ELPYE LDQXS DFVXV UDNSP ECMSA IDMJV DQWVG ESCRQ ETVXU TZZXB SPLSR KYWAF EMCXP TTVKB ELOPR SYWXE OQVEG

OTAIV RPZXU NNPIF NELSJ FWWAR OXCGU TSMEV GPWJG EDUEY NEZSY KPIQR RTMHF OCPSH LTBWC UDWRG TSMHR NOAXU HPNME RPLJR EPIKY IDMTY SEPMF WSGXU OYAMQ NAZEP SEWXB ELTMM UCIPF

SLOVB ERZSH AHICV NLTIG DAIWG TCWYO RLVHU HPESE LLVHF LTOLG AWWJN NLKOB RDWRG OEAEQ HPAQN SPZXN EHWVY SEBMZ EEIFB ELVHG UYOIF GCIZV EPIKY ECQRT TTKEY RXMRG ETAXU EWMGG

Season Episode Document

Breaking the Vigenère cipher

• •

Your task is to de ipher the ipher below, that you will nd in the

Terminale Euro Go to the website

03 15 Cipher 9

Partage Profs /

folder.

math.u sd.edu/∼ rypto/java/EARLYCIPHERS/Vigenere.html

and

follow the instru tions to break the ipher.

•

On e the de ryption pro ess is omplete, re reate the initial plain text by guessing the pun tuation and paragraphs, then send your nal answer to

mi kael.vedrinefree.fr.

These answers will be graded.

IAMWX PACZL SDPTB OGYAW BMOQQ NAOVW OYVIV DAWOX SVQPL CJBBD UOCCW WDTBK IIHPD IIOZB IOVIE RVQBR TDCVZ SNQWQ NDCVV NBZGV WJFSD IIUTB RVBBX TTCCQ INCEQ UOVQV ANAIO AXQWX HOQIV RRWTO SMCJL TAFWP TTODL SXOZG IIU

TCHPU TOCAK DJWBS OYOGZ SOOZW CJBDR PPHIP RDBOR LYHPL IIGLL SCCEV RJIOK TDHEL AIWUD RVWVR RJPBD HDQPP SOOVW AOHIL HJKVE NYOAZ TJWUS PJBBK GACTN AHOVR DMOEQ LOCEQ NOTCO TDBOP IOGIB NNQIU AXOJL VDRXR IIUWI

OPUPR OROLR RVQBL HJQTD SAIVF LPHQR YNHQF UOWBV NFGVD SXWXO AXVQO OPHKK LGOBW LNAIQ NVDIU IITZR AIVWO LTHPU NDBOD YVBWF IOVWX AMHQW INPIV SYWLI FNCLR TJVQP IOWAQ LJTAX UMYGV AIMBK OGZQQ NRWVG ROFIB TCOBZ

UOOTO UWHQQ CVZTB IHHPD TDCVL NNHPR PJGAL PPFXR TPFIO IIOZB DOVIW IGRPR ADBIS KICEV WDHPR MWCWN DNHWG OWPQQ NVPQO CVGQR RYIUE SOVWX INWIP IIRIF MDBIW ANWAD OOOOR CCQCV HVRWZ IIUIE GVHBZ ORBWL AGCNB OMBWX

HDGBR GRCZO YJIER TVQPL NBOBE UNOVG BDZQW ROIXW LTCVO FVQBR IOACV OYOJU ONWBL NJHEK UMGEK SVBLV ATPCW GVBLS IOMWI NVZKK AIWUD GCHAW GJWVJ HVAXL IIUIQ FGMBR SNWXB TJAIU SYCEQ OPHBL IGWOK TDGIQ OPHPD TICBL

RTVIG DOVIW UGRVW LYRWQ IMHPD SJTLR YACZQ OVPWX YJTXO RTCCF TOVQQ ADBPD OICNV YVQWZ YNIKK CCCWO ACIUD UGGIW IOGWZ IGRXU LNOKK OPGAK TJGPR OIOUD DCOXS ANIOD YVFVQ YAWTO AGCVJ NFZQQ TICZD AXQWX SDHQV OIHPD

HVRIF AXVQO CJBAW TFBWZ NYVIV RHOVW OOWKL TDHAS ATPCW AIHLR KKFIF SICWS TVHCV DJUWU AIWUD IIUBK NWFIL IIUQW NVTIF OYWOB IGRAL OPZLQ WTCCK NRWBK YDBLL RWCEO OMWAL IIGIV WDBLL GNZCO NTKIU NOCNX TJRIB TVQPL

HVAXL DXOVW AIHTB AIMBK AHCVJ AOCUV NBOVD RDAIU MVBGD TCWAR TDQIO PJGQW QPCIV LDCVZ LNQIQ AODIU NDGVR RVDQG TRVQF IIACV NVPQO OOQTD OROJX BJMAD VDRCD IOWAD TVRZB RJAIQ NBQWX LDBOG MBZWZ PVBLG AIRIS LYRWQ

OIHWV HDBSD RPBIF IIUIF SOWBV IIHWZ DPZBV YNQPR FJFUR ROVIW LTCZI IJBQW WDHPR ANBWW NJHIG AHCCQ TDBBK LTTWU HDGAW IXCZV IOMKR SNWBD NXVWI NYUQU LDHGW SOCZB MJBWW TDQUR NOFGU INHIQ OAZIP ODBOD RVQBL TFBWZ

TVBLX NYDWV RJGAI HDZLV MVBGL HDQPJ AXHIQ OGRIB FKZIB PPHAR ADZVR INDTD UMCZG BJFVZ DNIJW TKCAL AOQTD MNCXL AMHTL CCCWO NQWVF SDUVR BMWOK LNCNK HVHGR AWCCW OICCV OIZQJ OVRVR TACTG PGWOK COWDL CVZLL AIMBK

10

Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 1

Cipher 1 : plain text

They say that the prospe t of being hanged in the morning on entrates a man's mind wonderfully ; unfortunately, what the mind inevitably on entrates on is that, in the morning, it will be in a body that is going to be hanged. The man going to be hanged had been named Moist von Lipwig by doting if unwise parents, but he was not going to embarrass the name, insofar as that was still possible, by being hung under it. To the world in general, and parti ularly on that bit of it known as the death warrant, he was Alfred Spangler. And he took a more positive approa h to the situation and had on entrated his mind on the prospe t of not being hanged in the morning, and, most parti ularly, on the prospe t of removing all the rumbling mortar from around a stone in his ell wall with a spoon. So far the work had taken him ve weeks and redu ed the spoon to something like a nail le. Fortunately, no one ever ame to hange the bedding here, or else they would have dis overed the world's heaviest mattress. It was a large and heavy stone that was urrently the obje t of his attentions, and, at some point, a huge staple had been hammered into it as an an hor for mana les. Moist sat down fa ing the wall, gripped the iron ring in both hands, bra ed his legs against the stones on either side, and heaved. His shoulders aught re, and a red mist lled his vision, but the blo k slid out with a faint and inappropriate tinkling noise. Moist managed to ease it away from the hole and peered inside. At the far end was another blo k, and the mortar around it looked suspi iously strong and fresh. Just in front of it was a new spoon. It was shiny. As he studied it, he heard the lapping behind him. He turned his head, tendons twanging a little ri of agony, and saw several of the wardens wat hing him through the bars. From Keyword : LUCKY

Going Postal, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 2

Cipher 2 : plain text

Some of the things you ould learn up a drainpipe at night were surprising. For example, people paid attention to small soundsthe li k of a window at h, the link of a lo k pi kmore than they did to big sounds, like a bri k falling into the street or even (for this was, after all, Ankh-Morpork) a s ream. These were loud sounds, whi h were, therefore, publi sounds, whi h, in turn, meant they were everyone's problem and, therefore, not mine. But small sounds were nearby and suggested su h things as stealth betrayed, and were, therefore, pressing and personal. Therefore, he tried not to make little noises. Below him, the oa h yard of the Central Post O e buzzed like an overturned hive. They'd got the turntable working really well now. The overnight oa hes were arriving and the new Überwald Flyer was gleaming in the lamplight. Everything was going right, whi h was, to the nighttime limber, why everything was going wrong. The limber thrust a bri k key into soft mortar, shifted his weight, moved his foo Damn pigeon ! It ew up in pani , his other foot slipped, his ngers lost their grip on the drainpipe, and when the world had stopped hurning, he was owing the postponement of his meeting with the distant obbles to his hold on a bri k key, whi h was, let's fa e it, nothing more than a long, at nail with a T-pie e grip. And you an't blu a wall, he thought. If you swing, you might get your hand and foot on the pipe, or the key might ome out. From Keyword : PARANO

Making Money, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 3

Cipher 3 : plain text

Sam Vimes sighed when he heard the s ream, but he nished shaving before he did anything about it. Then he put his ja ket on and strolled out into the wonderful late spring morning. Birds sang in the trees, bees buzzed in the blossom. The sky was hazy though, and thunderheads on the horizon threatened rain later. But for now, the air was hot and heavy. And in the old esspit behind the gardener's shed, a young man was treading water. Well ... treading, anyway. Vimes stood ba k a little way and lit a igar. It probably wouldn't be a good idea to employ a naked ame any nearer to the pit. The fall from the shed roof had broken the

rust. Good morning !" he said heerfully. Good morning, Your Gra e," said the industrious treadler. The voi e was higher pit hed that Vimes expe ted and he realized that, most unusually, the young man in the pit was in fa t a young woman. It wasn't entirely unexpe ted  the Assassins' Guild was aware that women were at least equal to their brothers when it

ame to inventive killing  but it nevertheless hanged the situation somewhat. I don't believe we've met ?" said Vimes. "Although I see you know who I am. You are ... ?" Wiggs, sir," said the swimmer. "Jo asta Wiggs. Honored to meet you, Your Gra e." Wiggs, eh ?" said Vimes. "Famous family in the Guild. 'Sir' will do, by the way. I think I on e broke your father's leg ?" From Keyword : AIRBAG

Nightwat h, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 4

Cipher 4 : plain text

Everything starts somewhere, although many physi ists disagree. But people have always been dimly aware of the problem with the start of things. They wonder aloud how the snowplow driver gets to work, or how the makers of di tionaries look up the spelling of the words. Yet there is the onstant desire to nd some point in the twisting, knotting, raveling nets of spa e-time on whi h a metaphori al nger an be put to indi ate that here, here, is the point where it all began ... Something began when the Guild of Assassins enrolled Mister Teatime, who saw things dierently from other people, and one of the ways that he saw things dierently from other people was in seeing other people as things (later, Lord Downey of the Guild said, "We took pity on him be ause he'd lost both parents at an early age. I think that, on ree tion, we should have wondered a bit more about that"). But it was mu h earlier even than that when most people forgot that the very oldest stories are, sooner or later, about blood. Later on they took the blood out to make the stories more a

eptable to hildren, or at least to the people who had to read them to

hildren rather than the hildren themselves (who, on the whole, are quite keen on blood provided it's being shed by the deserving*), and then wondered where the stories went. And earlier still when something in the darkness of the deepest aves and gloomiest forests thought : what are they, these reatures ? I will observe them ... From Keyword : MUSIC

Hogfather, by Terry Prat hett

Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 5

14

Cipher 5 : plain text

Against the stars a turtle passes, arrying four elephants on its shell. Both turtle and elephants are bigger than people might expe t, but out between the stars the dieren e between huge and tiny is, omparatively speaking, very small. But this turtle and these elephants are, by turtle and elephant standards, big. They arry the Dis world, with its vast lands, louds apes, and o eans. People don't live on the Dis any more than, in less hand- rafted parts of the multiverse, they live on balls. Oh, planets may be the pla e where their body eats its tea, but they live elsewhere, in worlds of their own whi h orbit very handily around the enter of their heads. When gods get together they tell the story of one parti ular planet whose inhabitants wat hed, with mild interest, huge ontinent-wre king slabs of i e slap into another world whi h was in astronomi al terms, right next doorand then did nothing about it be ause that sort of thing only happens in Outer Spa e. An intelligent spe ies would at least have found someone to omplain to. Anyway, no one seriously believes in that story, be ause a ra e quite that stupid would never even have dis overed slood.* People believe in all sorts of other things, though. For example, there are some people who have a legend that the whole universe is arried in a leather bag by an old man. They're right, too. Other people say : hold on, if he's arrying the entire universe in a sa k, right, that means he's arrying himself and the sa k inside the sa k, be ause the universe ontains everything. In luding him. And the sa k, of ourse. Whi h ontains him and the sa k already. As it were. To whi h the reply is : well ? All tribal myths are true, for a given value of "true." From Keyword : FITTER

The Last Continent, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 6

Cipher 6 : plain text

It was a moonless night, whi h was good for the purposes of Solid Ja kson. He shed for Curious Squid, so alled be ause, as well as being squid, they were urious. That is to say, their uriosity was the urious thing about them. Shortly after they got urious about the, lantern that Solid had hung over the stern of his boat, they started to be ome urious about the way in whi h various of their number suddenly van-ished skyward with a splash. Some of them even be ame uriousvery briey uriousabout the sharp barbed thing that was oming very qui kly toward them. The Curious Squid were extremely urious. Unfortunately, they weren't very good at making onne tions. It was a very long way to this shing ground, but for Solid the trip was usually well worth it. The Curious Squid were very small, harmless, di ult to nd and re koned by

onnoisseurs to have the foulest taste of any reature in the world. This made them very mu h in demand in a ertain kind of restaurant where highly skilled hefs made, with great are, dishes ontaining no tra e of the squid whatsoever. Solid Ja kson's problem was that tonight, a moonless night in the spawning season, when the squid were espe ially urious about everything, the hef seemed to have been at work on the sea itself. There was not a single interested eyeball to be seen. There weren't any other sh either, and usually there were a few attra ted to the light. He'd aught sight of one. It had been making through the water extremely fast in a straight line. From Keyword : HAPPY

Jingo, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 7

Cipher 7 : plain text

There is where the gods play games with the lives of men, on a board whi h is at one and the same time a simple playing area and the whole world. And Fate always wins. Fate always wins. Most of the gods throw di e but Fate plays hess, and you don't nd out until too late that he's been using two queens all along. Fate wins. At least, so it is laimed. Whatever happens, they say afterwards, it must have been Fate.* Gods an take any form, but the one aspe t of themselves they annot hange is their eyes, whi h show their nature. The eyes of Fate are hardly eyes at all  just dark holes into an innity spe kled with what may be stars or, there again, may be other things. He blinked them, smiled at his fellow players in the smug way winners do just before they be ome winners, and said : "I a

use the High Priest of the Green Robe in the library with the double-handed axe." And he won. He beamed at them. "No one likeh a poor winner," grumbled Oer the Cro odile God, through his fangs. "It seems that I am favoring myself today," said Fate. "Anyone fan y something else ?" The gods shrugged. "Mad Kings ?" said Fate pleasantly. "Star-Crossed Lovers ?" "I think we've lost the rules for that one," said Blind Io, hief of the gods. "Or Tempest-Wre ked Mariners ?" "You always win," said Io. "Floods and Droughts ?" said Fate. "That's an easy one." A shadow fell a ross the gaming table. The gods looked up. "Ah," said Fate. "Let a game begin," said the Lady. From Keyword : WALLS

Interesting time, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 8

Cipher 8 : plain text

Now onsider the tortoise and the eagle. The tortoise is a ground-living reature. It is impossible to live nearer the ground without being under it. Its horizons are a few in hes away. It has about as good a turn of speed as you need to hunt down a lettu e. It has survived while the rest of evolution owed past it by being, on the whole, no threat to anyone and too mu h trouble to eat. And then there is the eagle. A reature of the air and high pla es, whose horizons go all the way to the edge of the world. Eyesight keen enough to spot the rustle of some small and squeaky reature half a mile away. All power, all ontrol. Lightning death on wings. Talons and laws enough to make a meal of anything smaller than it is and at least take a hurried sna k out of anything bigger. And yet the eagle will sit for hours on the rag and survey the kingdoms of the world until it spots a distant movement and then it will fo us, fo us, fo us on the small shell wobbling among the bushes down there on the desert. And it will leap . . . And a minute later the tortoise nds the world dropping away from it. And it sees the world for the rst time, no longer one in h from the ground but ve hundred feet above it, and it thinks : what a great friend I have in the eagle. And then the eagle lets go. And almost always the tortoise plunges to its death. Everyone knows why the tortoise does this. Gravity is a habit that is hard to shake o. No one knows why the eagle does this. There's good eating on a tortoise but, onsidering the eort involved, there's mu h better eating on pra ti ally anything else. It's simply the delight of eagles to torment tortoises. But of ourse, what the eagle does not realize is that it is parti ipating in a very rude form of natural sele tion. One day a tortoise will learn how to y. From Keyword : ALIEN

Small Gods, by Terry Prat hett

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Season 03 • Episode 15 • Breaking the Vigenère cipher

Document 9

Cipher 9 : plain text

If Youth, throughout all history, had had a hampion to stand up for it ; to show a doubting world that a hild an think ; and, possibly, do it pra ti ally, you wouldn't onstantly run a ross folks today who laim that "a hild don't know anything." A hild's brain starts fun tioning at birth ; and has, amongst its many infant onvolutions, thousands of dormant atoms, into whi h God has put a mysti possibility for noti ing an adult's a t, and guring out its purport. Up to about its primary s hool days a hild thinks, naturally, only of play. But many a form of play ontains dis iplinary fa tor. "You an't do this," or "that puts out out," shows a hild that it must think, pra ti ally, or fail. Now, if, throughout hildhood, a brain has no opposition, it is plain that it will attain a position of "status quo," as with our ordinary animals. Man knows not why a ow, dog, or lion was not born with a brain on a par with ours ; why su h animals annot add, subtra t, or obtain from books and s hooling, that paramount position whi h Man Holds today. But a human brain is not in that lass. Constantly throbbing and pulsating, it rapidly forms opinions ; attaining an ability of its own ; a fa t whi h is startlingly shown by an o

asional hild "prodigy" in musi or s hool work. And as, with our dumb animals, a

hild's inability onvin ingly to impart its thoughts to us, should not lass it as ignorant. Upon this basis I am going to show you how a bun h of bright young folks did nd a

hampion ; a man with boys and girls of his own ; a man of so dominating and happy individuality that Youth is drawn to him as is a y to a sugar bowl. It is a story about a small town. It is not a gossipy yarn ; nor is it a dry, monotonous a

ount, full of su h

ustomary "ll-ins" as "romanti moonlight asting murky shadows down a long, winding ountry road." Nor will it say anything about tinklings lulling distant folds ; robins

arolling at twilight, nor any "warm glow of lamplight" from a abin window. No. It is an a

ount of up-and-doing a tivity ; a vivid portrayal of Youth as it is today ; and a pra ti al dis arding of that worn-out notion that "a hild don't know anything." From Keyword : AVOID

Gadsby, by Ernest Vin ent Wright