Video: AES encryption thiab decryption ua haujlwm li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Encryption ua haujlwm los ntawm kev noj cov ntawv dawb thiab hloov mus rau hauv cipher ntawv, uas yog ua los ntawm seemingly random cim. Tsuas yog cov uas muaj tus yuam sij tshwj xeeb tuaj yeem ua tau decryption nws. AES siv tus yuam sij symmetrical encryption , uas koom nrog kev siv tsuas yog ib tus yuam sij zais cia rau cipher thiab decipher cov ntaub ntawv.
Tsuas yog li ntawd, AES encryption yog dab tsi nrog piv txwv?
Block cipher yog ib qho algorithm uas encrypts cov ntaub ntawv ntawm ib lub hauv paus. Qhov loj ntawm txhua qhov thaiv feem ntau yog ntsuas hauv cov khoom. AES , rau piv txwv , yog 128 ntsis ntev. Lub ntsiab lus, AES yuav ua haujlwm ntawm 128 me ntsis ntawm plaintext los tsim 128 me ntsis ntawm ciphertext. Cov yuam sij siv hauv AES encryption yog tib cov yuam sij siv hauv AES decryption.
AES encryption puas tuaj yeem tawg? Cov kab hauv qab yog tias yog AES tau yuav raug kev txom nyem, lub ntiaj teb yuav los txog rau ib tug standstill. Qhov txawv ntawm tawg tus AES -128 algorithm thiab AES - 256 algorithm suav hais tias tsawg heev. Thaum kawg, AES tsis tau muaj tawg tseem thiab muaj kev nyab xeeb tiv thaiv txhua qhov kev tawm tsam brute quab yuam tawm tsam kev ntseeg thiab kev sib cav.
Ua raws li qhov xav tau, koj siv AES encryption li cas?
AES siv qhov hloov pauv hloov pauv network (SPN) thaiv cipher algorithm. Cov lus qhib tau hloov mus rau cov lus ruaj ntseg los ntawm ob peb kauj ruam. Nws pib nrog txhua qhov thaiv ntawm cov ntawv dawb raws li tus qauv loj. Cov lus tau muab tso rau hauv ib qho array, thiab tom qab ntawd ib qho kev hloov pauv cipher ua tiav rau encryption cov lus.
Vim li cas AES algorithm siv?
Ntawm nws qhov yooj yim tshaj plaws, AES yog cryptographic siv algorithm tiv thaiv cov ntaub ntawv hluav taws xob. Nws yog symmetric block cipher uas tuaj yeem encrypt thiab decrypt cov ntaub ntawv. Encryption converts cov ntaub ntawv mus rau ib tug unintelligible daim ntawv hu ua ciphertext. Decryption hloov cov ntaub ntawv rov qab rau hauv nws daim ntawv qub hu ua plaintext.
Pom zoo:
Vim li cas symmetric encryption sai dua asymmetric encryption?
Rau cov txheej txheem encrypt / decrypt lub luag haujlwm, symmetrical algorithms feem ntau ua tau sai dua li lawv cov asymmetrical counterparts. Qhov no yog vim lub fact tias asymmetric cryptography yog loj heev inefficient. Symmetric cryptography yog tsim los rau kev ua haujlwm zoo ntawm cov ntaub ntawv loj
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