Yog tias koj tuaj yeem nkag siab txog qhov sau, ces nws yog nyob rau hauv cov ntawv dawb. Ciphertext, los yog cov ntawv encrypted, yog ib cov ntawv randomized thiab cov lej uas tib neeg tsis tuaj yeem ua rau muaj kev nkag siab ntawmIb qho kev encryption algorithm siv nyob rau hauv cov lus plaintext, khiav lub algorithm ntawm plaintext, thiab tsim ib tug ciphertext.
Plaintext hauv cryptography yog dab tsi?
Plaintext yog dab tsi encryption algorithms, lossis ciphers, hloov cov lus encrypted rau. Nws yog cov ntaub ntawv nyeem tau - suav nrog cov ntaub ntawv binary - hauv daim ntawv uas tuaj yeem pom lossis siv yam tsis xav tau tus yuam sij decryption lossis decryption ntaus ntawv.
Koj txhais li cas los ntawm ciphertext?
Ciphertext. Cipher yog ib qho algorithm uas yog siv rau cov ntawv dawb kom tau txais cov ntawv cipherNws yog qhov tsis tau nyeem tau ntawm qhov encryption algorithm. Lub sij hawm "cipher" qee zaum siv los ua lwm lo lus rau ciphertext. Ciphertext tsis nkag siab txog thaum nws tau hloov dua siab tshiab rau hauv cov ntawv nyeem uas siv tus yuam sij.
ciphertext nrog piv txwv yog dab tsi?
Ciphertext piv txwv
Caesar cipher yog ib qho kev hloov pauv cipher uas txhua tsab ntawv hauv cov ntawv dawb yog "hloov" qee qhov chaw hauv cov tsiaj ntawv. Piv txwv li, nrog kev hloov ntawm 1, A yuav yog B, B yuav hloov los ntawm C, thiab lwm yam.
Kev sib raug zoo ntawm daim ntawv dawb thiab ntawv cim npe hu li cas?
Theory. Hauv Shannon cov ntsiab lus qub, tsis meej pemhais txog kev ua kom muaj kev sib raug zoo ntawm cov ntawv ciphertext thiab tus yuam sij symmetric kom nyuaj thiab koom nrog ntau li ntau tau; diffusion yog hais txog dissipating cov qauv kev txheeb cais ntawm plaintext hla feem ntau ntawm ciphertext.
