Feem ntau cov neeg tsis paub nws, tab sis peb cia siab rau network encryption yuav luag txhua zaus peb mus hauv online. Rau txhua yam los ntawm banking thiab mus kav khw email, peb nyiam peb cov kev ua lag luam hauv Internet kom zoo-thaiv, thiab encryption pab ua qhov ntawd.
Network Encryption yog dab tsi?
Encryption yog ib txoj hauv kev zoo thiab zoo rau kev ceev cov ntaub ntawv network. Cov txheej txheem ntawm encryption hides cov ntaub ntawv los yog cov ntsiab lus ntawm cov lus nyob rau hauv xws li ib txoj kev uas cov ntaub ntawv qub yuav tsuas tau zoo los ntawm kev sib decryption txheej txheem. Encryption thiab decryption yog hom kev kawm hauv cryptography - qhov kev qhuab qhia kev kawm tom qab kev ruaj ntseg sib txuas lus.
Ntau yam encryption thiab cov kev cai lij choj (hu ua algorithms ) muaj nyob. Tshwj xeeb hauv Internet, nws nyuaj heev kom cov ntsiab lus ntawm cov algorithms tiag zais cia. Cryptographers to taub qhov no thiab tsim lawv cov kev qhia kom lawv ua haujlwm txawm tias lawv cov ntsiab lus yuav ua rau pej xeem pom. Feem ntau cov ntaub ntawv sau ciaj ciam dhau los ua tiav qhov kev tiv thaiv los ntawm kev siv cov yawm sij .
Dab tsi yog qhov "Encryption Key"?
Nyob rau hauv computer cryptography, lub ntsiab yog qhov ntev ntawm cov khoom siv los ntawm encryption thiab decryption algorithms. Piv txwv, cov nram qab no yog ib qho tseem ceeb hypothetical 40-ntsis:
00001010 01101001 10011110 00011100 01010101
Ib qho kev siv algorithm yuav siv cov lus tshaj tawm uas tsis tau muaj neeg tsis muaj lo lus, thiab qhov tseem ceeb xws li cov saum toj no, thiab hloov cov lus tseem ceeb zauv raws li qhov tseem ceeb cov khoom siv los tsim cov lus tshiab encrypted. Conversely, lub decryption algorithm yuav siv ib qho kev sib txuas lus encrypted thiab restores nws cov thawj daim ntawv uas siv ib los yog ntau tus yuam sij.
Ib co cryptographic algorithms siv ib qhov tseem ceeb rau ob qho tib si encryption thiab decryption. Xws li qhov tseem ceeb yuav tsum tau khaws zais cia; txwv tsis pub, tus neeg twg uas paub txog qhov tseem ceeb uas siv los xa lus tuaj yeem muab qhov tseem ceeb rau qhov kev siv qiv nyiaj los nyeem cov lus ntawd.
Lwm cov algorithms siv ib qhov tseem ceeb rau kev encryption thiab ob, qhov tseem ceeb txawv rau decryption. Qhov tseem ceeb encryption yuav nyob pej xeem nyob rau hauv cov ntaub ntawv no, raws li tsis paub txog cov lus ceeb toom tseem ceeb yuav tsis tau nyeem. Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nrab
Encryption ntawm tes hauj lwm hauv tsev
Cov chaw siv Wi-Fi hauv tsev pab txhawb ntau txoj kev ruaj ntseg nrog WPA thiab WPA2 . Thaum cov no tsis yog qhov muaj zog tshaj plaws ntawm kev nkag siab algorithms hauv hav zoov, lawv txaus los tiv thaiv cov tswv yim hauv tsev los ntawm lawv cov tsheb khiav qeeb los ntawm cov neeg sab nrauv.
Txiav txim seb puas zoo thiab encryption zoo li cas ntawm lub tsev network los ntawm kev khij qhov broadband router (los yog lwm lub qhov rooj hauv lub qhov rooj ).
Encryption hauv Internet
Niaj hnub Web browsers siv kev ruaj ntseg Sockets Txheej (SSL) raws kev ruaj ntseg online muas. SSL ua haujlwm los ntawm kev siv tus yuam sij pej xeem rau encryption thiab lwm tus yuam sij rau kev cais. Thaum koj pom HTTPS qhov ntawm URL URL rau hauv koj tus browser, nws qhia tau hais tias SSL encryption yog tshwm sim tom qab lub scenes.
Lub luag hauj lwm ntawm Lub Ntev Length thiab Network Security
Vim tias ob qho WPA / WPA2 thiab SSL encryption ces hnyav hnyav heev ntawm cov yawm sij, ib qho kev ntsuas ntawm kev ua haujlwm ntawm network encryption rau cov ntsiab lus tseem ceeb - cov khoom hauv qhov tseem ceeb.
Cov kev siv thaum ntxov ntawm SSL nyob rau hauv lub Netscape thiab Internet Explorer Web browsers ntau xyoo dhau los siv tus txheej txheem 40-ntsis SSL encryption. Thawj qhov kev siv WEP rau kev siv tes hauj lwm siv 40-ntsis encryption yuam sij.
Hmoov tsis, 40-ntsis encryption dhau los ua kom yooj yim rau decipher los yog "tawg" los ntawm guessing qhov tseeb yuam lo lus tseem ceeb. Ib qho kev siv dag zog hauv kev siv cryptography hu ua brute-force decryption siv computer ua kom siv tau thiab xam txhua qhov tseem ceeb ntawm ib qho. 2-ntsis encryption, piv txwv li, yuav muaj plaub yam tseem ceeb rau kev xav:
00, 01, 10, thiab 11
3-ntsis encryption yuav yim tau qhov tseem ceeb, 4-ntsis encryption 16 tau qhov tseem ceeb, thiab ntxiv rau. Mathematically hais, 2 n tau qhov tseem ceeb muaj nyob rau tus n-ntsis qhov tseem ceeb.
Thaum 2 40 yuav zoo li tus xov tooj loj heev, nws tsis yooj yim rau cov computers niaj hnub ua kom tawg ntau cov kev sib txuas ua ke nyob rau hauv ib lub sij hawm luv luv. Tus tswv ntawm kev ruaj ntseg software pom tau hais tias yuav tsum tau ua kom lub zog zoo ntawm encryption thiab tsiv mus rau 128-ntsis thiab siab dua Encryption ntau ntau xyoo dhau los.
Piv rau 40-ntsis encryption, 128-ntsis encryption muaj 88 ntxiv cov khoom tseem ceeb ntev. Qhov no txhais mus rau 2 88 los yog ib tug neeg poob ntsej muag
309,485,009,821,345,068,724,781,056
ntxiv ob peb ua ke yuav tsum tau rau lub hlwb tawg. Qee cov nyiaj siv ua haujlwm saum toj no tshwm sim thaum muaj kev encrypt thiab decrypt cov lus tsheb nrog cov yuam sij no, tab sis cov txiaj ntsig nyob deb tshaj qhov nqi.