Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Chidimbu: Kunyange zvazvo shoko chairo rokuti "cryptanalysis" richiri idzva zvikuru (rakagadzirwa naWilliam Friedman muna 1920), nzira dzokuputsa nadzo makodhi uye ciphers dzakare zvikuru. Tsananguro yokutanga yakanyorwa ye cryptanalysis yakapiwa nomudzidzi wechiArabic womuzana remakore rechi9, Al-Kindi (anozivikanwawo se"Alkindus" muEurope), muA Manuscript on Deciphering Cryptographic Messages. Iri bhuku rinosanganisira rondedzero yenzira yekuongorora mafambiro (Ibrahim Al-Kadi, 1992- ref-3). Nyanzvi yokuItaly Giambattista della Porta akanga ari munyori webasa rokutanga pamusoro pekunyorwa kwemashoko "De Furtivis Literarum Notis". Kuongororwa kwehuwandu ndicho chinhu chinokosha chokuputsa mazita akawanda ekare. Mumitauro yomuzvarirwo, mamwe mabhii earufabheti anooneka kazhinji kazhinji kupfuura mamwe; muchiNgezi, "E" sezvingabvira ndiro tsamba inowanwa zvikurusa mumuenzaniso upi noupi womuchinyorwa chisina kunyorwa. Nenzira yakafanana, digraph "TH" ndiyo tsamba mbiri dzinobvira zvikurusa muChirungu, uye zvichingodaro. Kuongorora mafambiro kunotsamira pakukundikana kwechiverengero kuvanza idzi nhamba. Somuenzaniso, muchinyorwa chakareruka chokutsiva (panongotsiviwa tsamba imwe neimwe neimwe), tsamba inowanzoshandiswa zvikuru mumashoko akanyorwa ingangova inenge ichida "E". Kuongororwa kwechiverengero chechiverengo chakadaro naizvozvo kuri nyore, chero bedzi ciphertext yakareba zvakakwana kupa nhamba inomiririra yezvinyorwa zvearufabheti iyo ine. MuEurope mukati mezana remakore rechi15 nerechi16, pfungwa ye polyalphabetic substitution cipher yakagadzirwa, pakati pevamwe neFrench diplomat Blaise de Vigenère (1523<unk>96). Kwemakore anenge mazana matatu, cipher yaVigenère, iyo inoshandisa kiyi inodzokororwa kusarudza arufabheti dzakasiyana-siyana dzokunyora, yairangarirwa kuva yakachengeteka chose chose (le chiffre indéchiffrable<unk>"chipiyaniso chisingagoni kududzirwa"). Kunyange zvakadaro, Charles Babbage (1791<unk>1871) uye gare gare, vakazvimiririra, Friedrich Kasiski (1805<unk>81) vakabudirira kuputsa iyi cipher. MuHondo Yenyika I, vanogadzira zvinhu munyika dzinoverengeka vakagadzira michina yokunyoresa rotor yakadai seArthur Scherbius' Enigma, mukuedza kuderedza...  Mubvunzo: Ndiani akashandisa shoko rokuti cryptanalysis?
William Friedman