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>> [Halisi kucheza]

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>> ZAMYLA CHAN: Hebu kutekeleza
Vigenere, zaidi kidogo ya

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kupata cipher kuliko Kaisari.

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Nakala wazi ni enciphered kutumia
kamba badala ya integer.

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Kila tabia herufi katika
Nakala wazi ni kubadilishwa kwa

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barua katika Keyword.

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>> Katika mfano huu, Keyword ohai, O
sambamba na mabadiliko ya 14; H kwa

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kuhama ya 7; kuhama, ya
0; na mimi mabadiliko ya 8.

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Kama wameweza kwa mafanikio yako
Kaisari cipher, utakuwa ni nzuri

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mfumo ambayo wewe
inaweza kutekeleza Vigenere.

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Kama unaweza kuona, mbio Vigenere
cipher na tabia moja kama

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Keyword ni kitu kimoja
kama cipher Kaisari.

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>> hatua hiyo kuomba Vigenere
kama walivyofanya katika Kaisari.

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Keyword ni ya pili ya mstari amri
hoja, hivyo kupata huduma hiyo na argv1.

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Basi haja ya kuthibitisha kuwa muhimu
neno ni kweli kila herufi.

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Hapa ni wapi alpha
wanaweza kuja katika Handy.

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Kama una Keyword halali, kupata
nguvu kutoka kwa mtumiaji, na kisha

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uko tayari kwa encipher.

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>> Cipher Vigenere formula ni sawa
Kaisari formula, ila sasa k

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inakuwa k subscript j, kuonyesha
barua j-th wa Keyword.

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Hebu hatua kupitia mchakato huu.

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Sema alitaka kutuma ujumbe kwa yako
ajali, mimi kama wewe, lakini huna

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nataka kila mtu kujua.

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Hivyo unaweza kutumia cipher Vigenere na
Keyword panda, kwa sababu, vizuri, wewe pia

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kama pandas.

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>> barua ya kwanza, mimi, itakuwa kubadilishwa
na p, kutoa x, barua 15 baada ya mimi,

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kwa sababu 15 p ni 16
barua ya alfabeti.

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barua ijayo katika maandishi wazi ni
nafasi, hivyo kuwa ya kubadilishwa.

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Na index ya Keyword
si mabadiliko.

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>> Kisha barua ijayo katika maandishi wazi ni
l, kubadilishwa kwa, ambayo haina kuhama

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Nakala wazi barua wakati wote, kwa sababu
ni barua 0 ya alfabeti.

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mchakato unaendelea, kuendeleza
Keyword tabia kila wakati kuna

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mbili katika maandishi wazi.

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Mara baada ya barua ya mwisho katika Keyword ni
kufikiwa, Keyword Wraps kuzunguka na

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mabadiliko ya wazi ijayo
Nakala mbili na p.

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X lvne NOH.

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Jinsi ya kimapenzi.

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>> Hivyo kutokana na tabia, ni jinsi gani unaweza kubadilisha
kwamba katika sambamba

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cipher kuhama?

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Jaribu kulinganisha ASCII
maadili kwa kuhama.

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Labda unaweza kupata uhusiano
kati ya herufi na wao

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herufi index kutumia math ASCII.

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Unaweza kuongeza au Ondoa moja tabia
kutoka mwingine kupata

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wewe matokeo taka?

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>> Kumbuka kwamba mabadiliko kwa herufi kubwa
na herufi ndogo ni sawa.

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Hivyo labda itabidi kutambua mbili
formula sawa na kuwakilisha

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kuhama, moja kwa herufi kubwa
Keyword tabia, na moja

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kwa moja lowercase.

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>> Ijayo, kumbuka kwamba maendeleo Keyword
tu kama tabia katika

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Nakala wazi ni barua na kwamba
kesi ya wazi

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Nakala lazima zihifadhiwe.

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Hivyo kama sisi kuangalia formula kwa ajili ya
Vigenere kuhama, kuna mambo mawili index

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vigezo, i na j.

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Moja anaendelea kufuatilia msimamo katika bonde
maandishi, na wengine nafasi

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katika Keyword.

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Lakini maandishi yako wazi kuwa sana tena
kuliko Keyword yako, katika kesi ambayo yako

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Keyword index inahitaji wrap kuzunguka nyuma
mwanzo wa Keyword.

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>> Jinsi gani unaweza kufanya hili?

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Hebu kuangalia nyuma katika
modulo operator.

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Modulo inaelezwa ni salio
ya kugawa namba mbili.

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Lakini nini vitendo halisi
matumizi ya modulo?

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>> Naam, kusema kuwa kundi kubwa la
watu, na unahitaji kugawanya katika

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makundi matatu.

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Moja ya njia ya kugawanya watu katika makundi
ni kuwa na wao kuhesabu mbali.

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Wewe idadi kundi vikundi
namba 1, 2, na 3.

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mtu wa kwanza kusema 1,
2 ijayo, 3 ijayo.

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mtu baada ya kuwa watasema 1,
kwa sababu hakuna kikundi 4, na

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wanawake kuanza juu kutoka huko.

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>> Unaweza kutumia modulo kwa
kufanya kitu kimoja.

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Wakati huu, vikundi vya mapenzi
kuwa kikundi 0, 1, na 2.

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Mtu wa kwanza, idadi
1 modulo 3, ni 1.

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2 mtu modulo 3 ni 2.

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3 mtu modulo 3 ni 0.

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4 mtu modulo 3 anatoa 1, na hivyo
vikundi vinaweza wrap kote.

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>> Hivyo kama wewe kuchukua index na modulo
kwamba index na ukubwa wa upeo,

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matokeo kamwe kuwa zaidi au
sawa na ukubwa, kwa maana ya kwamba

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inaweza kuongeza index kama
kiasi kama wewe Ningependa.

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Na muda mrefu kama wewe modulo index kwa
idadi fulani, huwezi kupata idadi

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kubwa kuliko ile.

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Hivyo tuna watu 10 badala ya 5, na
wangeweza wote kupata ajili ya vikundi vya

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idadi 0, 1, au 2.

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>> Kujaribu kuomba hii kwa zaidi ya wrapping
Keyword, ila badala ya kuchagua

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watu ndani ya kundi idadi unataka
index ya Keyword ili uweze

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kupata tabia ya haki kwa
kuhama bila mno

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urefu wa kamba.

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Pamoja na kwamba, una yako
Vigenere cipher.

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Jina langu ni Zamyla, na hii ni CS50.

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