SSH1 vs SSH2
SSH (Secure Plhaub) yog cov txheej txheem uas siv los ua kom muaj kev ruaj ntseg rau cov ntaub ntawv sib txuas lus hauv tes hauj lwm. SSH tau pom los ntawm Tatu Ylonen (SSH Communications Security Corporation) hauv xyoo 1995. Cov txheej txheem no muab cov txheej txheem rau kev nyab xeeb cov ntaub ntawv kev thauj mus los, kev ua haujlwm ntawm cov chaw taws teeb thiab kev nyab xeeb tau qhib kev pabcuam network ntawm ob lub khoos phis tawj hauv lub network. Kev sib txuas lus yog tswj hwm raws li tus neeg siv khoom - server architecture (SSH Client thiab SSH server). SSH raws tu qauv tau tsim nrog ob lub npe hu ua SSH1 thiab SSH2.
SSH1 (Secure Plhaub Version 1)
SSH raws tu qauv version 1 tau pom nyob rau hauv 1995 thiab nws muaj peb txoj cai loj, hu ua SSH-TRANS, SSH-USERAUTH, thiab SSH-CONNECT.
SSH-TRANS: Nws yog cov txheej txheem thauj khoom (TCP / IP) uas pib muab kev lees paub tus neeg rau zaub mov, kev tsis pub lwm tus paub thiab kev ncaj ncees.
SSH-USERAUTH: Nws yog cov txheej txheem siv rau kev lees paub tus neeg siv khoom ntawm kev sib txuas lus. Cov txheej txheem no authenticates SSH tus neeg siv khoom hauv SSH server. Cov txheej txheem no tseem khiav dhau txheej thauj.
SSH-CONNECT: Nws yog cov txheej txheem kev sib txuas uas multiplexes encrypted cov ntaub ntawv rau hauv qee qhov kev xav tau. Cov txheej txheem no sau rau saum SSH-USERAUTH raws tu qauv.
Txhawm rau pib qhov kev sib txuas ruaj ntseg, tus neeg siv khoom xa nws cov ntaub ntawv pov thawj rau SSH server nrog 128 ntsis encryption. Txhua tus tswv tsev server muaj tus yuam sij host, uas yog txhawm rau txheeb xyuas cov neeg siv khoom sib txuas lus kom raug. Tsis tas li ntawd, nws yuav tsum muaj tus yuam sij rau pej xeem ntawm qhov cuam tshuam SSH server. Txhua ntu xa cov ntaub ntawv yog encrypted siv encryption algorithms (DES, 3DES, IDEA, Blowfish).
Lwm yam tshaj li kev nkag mus rau tej thaj chaw deb SSH tuaj yeem siv rau Tunnelling, X11 kev sib txuas, SFTP (SSH File transfer Protocol), SCP (Secure Copy), thiab kuj TCP chaw nres nkoj xa mus. TCP chaw nres nkoj 22 yog siv los ntawm SSH raws tu qauv los ntawm lub neej ntawd. Cov ntaub ntawv compression kuj txhawb los ntawm SSH. Cov yam ntxwv no muaj txiaj ntsig zoo thaum tus neeg siv-neeg rau zaub mov txuas nrog qis bandwidth thiab tuaj yeem siv los txhim kho qhov kev sib txuas ntawm kev sib txuas.
Hauv SSH version 1.5, cov neeg tsim khoom tau txheeb xyuas qee qhov tsis zoo. Hauv cov ntawv no, cov ntaub ntawv tsis raug tso cai nkag mus rau nruab nrab ntawm cov ntaub ntawv encrypted tau ua tau uas tuaj yeem ua rau muaj kev pheej hmoo siab rau cov ntaub ntawv kev nyab xeeb. Tsis tas li ntawd, qhov tsis zoo ntawm qhov tsis raug tso cai, ua phem rau tus neeg rau zaub mov xa mus rau kev lees paub rau lwm tus neeg rau zaub mov raug txheeb xyuas hauv xyoo 2001.
SSH2 (Secure Plhaub Version 2)
SSH2 tau qhia hauv 2006 nrog ntau yam kev txhim kho tseem ceeb tshaj SSH1. Txawm hais tias nws yog kev txhim kho ntawm SSH1, SSH2 tsis sib xws nrog SSH1. SSH2 tau sau dua tshiab nrog ntxiv cov txheej txheem tiv thaiv kom tsis txhob muaj qhov tsis zoo.
SSH2 siv cov txheej txheem sib txawv ntawm kev txhim kho thiab muaj zog algorithms rau encryption thiab authentication xws li DSA (Digital Signature Algorithm). SSH2 tsis yog software dawb li SSH1 lawm; tus tsim tawm ntawm SSH2 tau txwv tsis pub siv SSH2. Tsis zoo li SSH1, SFTP (Secure File Transfer) qhov kev pab cuam tau ua rau hauv pob SSH2 thiab nws siv tib yam Encryption raws tu qauv siv los ntawm SSH2, los encrypt cov ntaub ntawv ntws.
Qhov txawv ntawm SSH1 thiab SSH2 yog dab tsi?
Ntau UNIX raws li kev khiav hauj lwm systems muaj inbuilt SSH muaj peev xwm thiab ntau SSH muaj peev xwm consoles tau tsim rau lub qhov rais systems, ib yam nkaus (TeraTerm, Putty, OpenSSH, WinSCP thiab lwm yam).
• Raws li tau hais los saum toj no SSH2 yog ib qho kev txhim kho ntawm SSH1.
• SSH1 muaj qee cov ntaub ntawv paub txog cov teeb meem uas raug kho thiab rov coded hauv SSH2.
• Feem ntau qhov tseeb version ntawm txhua daim ntawv thov txhawb nqa rau nws cov ntawv qub, tab sis SSH2 tsis tau ua tiav nrog SSH1 thiab tseem yuav tsum tau ntawv tso cai SSH2.
