AES128 vs AES256

Advanced Encryption Standard (Advanced Encryption Standard, abbreviation: AES), Cov qauv no yog siv los hloov tus thawj DES thiab lug siv thoob qab ntuj.

AES yuav encrypt thiab decrypt sai hauv software thiab hardware, kuj yooj yim rau kev siv, thiab yuav tsum tau nco ntsoov nco ntsoov. Tam sim no yog deployed rau ib wider ntau yam.

1. Qhov txawv thiab ruaj ntseg theem ntawm AES128 thiab AES256?
2. Lawv noj rau lub tshuab?
3. Qhov kev kawm ntawm ob?
4. Xaiv seb yuav ua li cas thiaj xaiv tau txoj kev loj hlob?

AES yog ceev piv rau zoo ib yam li symmetric encryption algorithms. Piv txwv, Ib qho x86 server nrog AES-NI yuav tsawg kawg yog mus txog ib speed ntawm ob peb puas M/s. Ruaj ntseg yeej sib npaug rau lub neej tom ntej foreseable yav tom ntej, Txawm tias 128-bit yog txoj txaus tsis tau brute-yuam. Thaum tam sim no, 112-passwords tseem nyob rau hauv tej kev siv, thiab 128-bit yog kaum tawm txhiab lub sij hawm uas 112-bit, Li ntawd, nws yog nqi zoo siv 128-bit hauv xyaum (ib nyuag txuag cov chaw muab kev pab).

AES256 yuav siv sij hawm txog 40% Ntau tshaj AES128, ntxiv rau qhov ntxiv 4 Rounds ntawm round tseem ceeb tiam thiab tus corresponding SPN lag luam. tsis tas li ntawd, generating 256-bit tseem ceeb kuj yuav tsum tau overhead tshaj 128-bit keys, Tab sis qhov no ib feem ntawm cov overhead yuav tsum tau negligible.

Tus kawm ntawv ntawm kev ruaj ntseg yog lawm AES256 muaj kev ruaj ntseg dua AES128 vim tam sim no tsis muaj zoo heev algebraic nres tsuas yog rau brute quab yuam cracking.

Muaj ntau txoj kev nres rau software/hardware implementations ntawm AES-256 los yog AES-128, Li ntawd, nws yuav tsis yooj yim rau generalize.

Niaj hnub cryptography faib ua symmetric encryption thiab asymmetric encryption (pej xeem tseem ceeb encryption), Thiab cov neeg sawv cev algorithms yog DES (Tam sim no tsim rau hauv 3DES), AES, thiab RSA. Qhov chaw muab kev pab noj asymmetric encryption algorithms yog ntau dua uas symmetric encryption. Feem ntau, hybrid encryption processing yog tau, piv txwv, RSA siv rau cov tis tseem ceeb tis thiab sib khom lus, thiab AES siv rau encryption thiab decryption ntawm cov ntaub ntawv ua hauj lwm.

Ib txhia duab hais txog tej encryption thiab decryption symmetric thiab asymmetric algorithms:

Hais txog seb yuav siv cov AES128 los yog AES256 algorithm, Kuv ntaub ntawv xav tias AES128 yog txaus, Tau mas, AES256 yuav siv tau raws li ib tug li cas cuab yeej cuab tam.