Video: Puas yog CBC Mac ruaj ntseg?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Muab ib ruaj ntseg thaiv cipher, CBC - MAC yog ruaj ntseg rau cov lus ntev ntev. Txawm li cas los xij, los ntawm nws tus kheej, nws tsis yog ruaj ntseg rau cov lus sib txawv-ntev.
Hauv qhov no, yog CBC Mac kev sib tsoo resistant?
Qhov piv txwv no kuj qhia tau tias a CBC - MAC tsis tuaj yeem siv ua ib qho kev sib tsoo - tiv taus ib txoj haujlwm ua haujlwm: muab qhov tseem ceeb nws yog qhov tsis tseem ceeb los tsim cov lus sib txawv uas "hashes" rau tib lub cim.
Ib yam li ntawd, CBC Mac ua haujlwm li cas? Nrog CBC (Cipher Block Chaining)- MAC (Xov Xwm Authentication Code) peb txheeb xyuas cov lus nrog tus yuam sij zais cia. Yog lawv yog tib yam, ces Bob tau txuas ntxiv ua pov thawj nws tus kheej (tsuas yog nws ua tau muaj tus yuam sij zais cia uas Bob thiab Alice qhia), thiab cov lus tsis tau hloov pauv.
Qhov thib ob, CBC puas ruaj ntseg?
Kev tawm tsam ntawm RC4 thiab CBC tau tso peb cov kev xaiv tsawg heev rau cryptographic algorithms uas yog nyab xeeb los ntawm kev tawm tsam hauv cov ntsiab lus ntawm TLS. Qhov tseeb, tsis muaj cov ntawv ciphers txhawb los ntawm TLS 1.1 lossis ua ntej ntawd nyab xeeb . Cov kev xaiv nkaus xwb yog CBC hom ciphers lossis RC4.
Qhov luaj li cas hauv cov khoom ntawm CBC Mac thaum siv nrog DES encryption?
Nyob rau hauv cov ntaub ntawv ntawm CBC - MAC nrog Triple- DES uas yog qhov loj ntawm qhov thaiv ntawm 3DES uas yog 64- me ntsis (los yog luv luv ntawm nws). Yog tias koj cov ntaub ntawv ntev dua li ntawd, koj tsis tuaj yeem "decrypt" nws, vim tias tam sim no muaj ntau txoj kev daws teeb meem.
Pom zoo:
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Dab tsi yog kev ruaj ntseg ruaj ntseg thiab muaj nyob rau hauv kev ruaj ntseg?
Kev ceev ntiag tug txhais tau hais tias cov ntaub ntawv, cov khoom thiab cov peev txheej raug tiv thaiv los ntawm kev tsis pom zoo thiab lwm yam kev nkag. Kev ncaj ncees txhais tau tias cov ntaub ntawv raug tiv thaiv los ntawm kev hloov pauv tsis tau tso cai los xyuas kom meej tias nws ntseeg tau thiab raug. Muaj txhais tau hais tias cov neeg siv tau tso cai nkag tau rau hauv cov tshuab thiab cov peev txheej uas lawv xav tau