JOAAT Hash Code Kalkuleta

Aikin hash na JOAAT (Jenkins One At A Time) aikin hash ne wanda Bob Jenkins, sanannen masanin kimiyyar kwamfuta ya tsara shi a fagen hashing algorithms. Ana amfani da shi ko'ina saboda sauƙi, saurinsa, da kyawawan kaddarorin rarrabawa, yana sa ya zama mai tasiri don duba tebur na hash, ƙididdiga, da ƙididdigar bayanai. Yana fitar da lambar zanta 32 bit (4 byte), yawanci ana wakilta azaman lambar hexadecimal mai lamba 8.

Cikakken bayyanawa: Ban rubuta takamaiman aiwatar da aikin hash da aka yi amfani da shi akan wannan shafin ba. Daidaitaccen aiki ne wanda aka haɗa tare da yaren shirye-shiryen PHP. Na yi mahaɗin yanar gizo ne kawai don sanya shi a fili a nan don dacewa.

Game da JOAAT Hash Algorithm

Ni ba masanin lissafi ba ne, amma zan yi ƙoƙarin bayyana wannan aikin hash ta hanyar amfani da kwatankwacin da ƴan uwana waɗanda ba mathematics za su iya fahimta ba. Idan kun fi son ingantaccen ilimin kimiyya, cikakken bayanin lissafi, na tabbata za ku iya samun hakan a wani wuri ;-)

Yi tunanin JOAAT kamar yin miya ta musamman. Kuna da jerin abubuwan sinadaran (wannan shine bayanan shigar ku, kamar kalma ko fayil), kuma kuna son haɗa su ta yadda ko da kun canza ƙaramin abu ɗaya kawai - kamar ƙara ɗan gishiri kaɗan - daɗin miya ya canza gaba ɗaya. Wannan "dandano" shine darajar zanta, lamba ta musamman dake wakiltar shigar ku.

Aikin JOAAT yana yin wannan a matakai huɗu:

Mataki na 1: Farawa da Tukwane mara komai (Farawa)

Za ku fara da tukunyar miya mara komai. A cikin JOAAT, wannan "tukunya" yana farawa da lamba 0.

Mataki na 2: Haɗa Sinadaran Daya A Lokaci (Sarrafa Kowacce Byte)

Yanzu, kuna ƙara kayan aikin ku ɗaya bayan ɗaya. Ka yi tunanin kowane harafi ko lamba a cikin bayananku yana kama da ƙara wani yaji daban a tukunyar.

• Ƙara kayan yaji (ƙara darajar harafin zuwa tukunyar ku).
• Dama da ƙarfi (haɗa shi ta hanyar ninka dandano tare da motsi na motsa jiki na musamman - wannan kamar "canzawa") na lissafi ne.
• Ƙara juzu'i mai ban mamaki (jifa a cikin ƙwanƙwasa bazuwar - wannan shine aikin XOR, wanda ke taimakawa cakuɗe cakuda).

Mataki na 3: Kayayyakin Sirrin Ƙarshe (Haɗin Ƙarshe)

Bayan kun ƙara duk abubuwan da kuke buƙata, za ku sake yin wasu ɓangarorin sirri da girgiza don tabbatar da ɗanɗanon ba shi da tabbas. Wannan shine inda JOAAT yayi ƴan matakai na ƙarshe-da-scramble don tabbatar da sakamakon ya zama na musamman.

Mataki na 4: Gwajin ɗanɗano (Fitowa)

A ƙarshe, kun ɗanɗana miya - ko kuma a yanayin JOAAT, kuna samun lamba (ƙimar hash) wanda ke wakiltar ɗanɗanon miya na musamman. Ko da ƙaramin canji a cikin kayan abinci (kamar canza harafi ɗaya a cikin shigarwar ku) zai ba ku dandano daban-daban (lamba mabanbanta).