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Re: ftp vs. http servers [was Re: lug-bg: Slackware 9.1]


  • Subject: Re: ftp vs. http servers [was Re: lug-bg: Slackware 9.1]
  • From: Vesselin Kolev <vlk@xxxxxxxxxxxxxxxxx>
  • Date: Tue, 30 Sep 2003 13:23:22 +0300
  • Organization: Laboratory of Chemical Physics & Engineering, University of Sofia, Bulgaria

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>
> Също като rsync: и двете страни имат доста да изчисляват.  А разликата
> между FTP (или HTTP) и SFTP в локална мрежа е голяма (поне два пъти,
> дори и ако двата компютъра са сравнително бързи).

Ehe:) Chak 2 pyti.. silno kazano. Ponezhe naposledyk mi se nalozhi da pravia
shema, pri koiato osven cryptiran kanal traibva da ima i TLS login, napravih i
seria testove. Ako iskash moga da ti napravia i zhiva demonstracia. 

Ta shemata e slednata. ProFTPD v dva rezhima: TLS i non-TLS. 

TLS: Login s X.509 certificate - RSA 2048 bits 
TLS: handshake : Key Exchange-RSA-2048 (RSA key from cert.)
TLS: handshake : Authentication-RSA-2048 (RSA key from cert.)
TLS: handshake : Encryption-BlowFish-128 (random generated key)

non-TLS : plain text login

Celta beshe transfer na 120 faila, kato za vzemaneto na vseki fail se izpolzva
login. T.e. login-transfer-logout

Slediat se dva etapa:

1) Skorost na login processa
2) Skorost na obmena na failovete

FTP Server:

CPU : Athlon 900 MHz
RAM: 512 DDR

HDD: Seagate SATA/7200/8MB

OS: Linux Mandrake 9.1
FTPD: ProFTPD 1.2.9rc2(TLS patched)

Rezultati:

1) Po pokazatel skorost na login processa - kakto e za ochakvane
pecheli plain text shemata, no samo s 13% pred TLS login (pri CPU
s po-malka taktova chestota razlikata nelineiono narastva zaradi RSA).
Nuzhno e da se znae, che sypostavkata ne e mnogo korektna, zashtoto
kato cialo TLS login processa vkliuichva tri etapa: udostoveriavane,
obmen na kliuch, i nachalo na kodiraneto.

2) Po pokazatel scorost na obmen na fail - razlikata e edna 5%. Vsasnost
tia zavisi ot izpokzvania encryption algorithm.

Beshe napraven opit i sys sftp server, vmesto s ProFTPD. Prezultatite v
sravnenie s ProFTPD sa v ramkite na greshkata na izmervaneto...

  Pozdravi
      Beco
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