229 lines
4.1 KiB
Text
229 lines
4.1 KiB
Text
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#LyX 1.4.3 created this file. For more info see http://www.lyx.org/
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\lyxformat 245
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\begin_document
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\begin_header
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\textclass article
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\begin_preamble
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\usepackage{hyperref}
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\usepackage{html}
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\usepackage{german}
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\end_preamble
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\language ngerman
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\inputencoding auto
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\spacing single
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\papersize default
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\use_geometry false
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\use_amsmath 1
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\cite_engine basic
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\paperorientation portrait
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation skip
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\defskip medskip
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\quotes_language swedish
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\papercolumns 1
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\papersides 1
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\paperpagestyle default
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\tracking_changes false
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\output_changes true
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\end_header
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\begin_body
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preview false
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preview false
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status collapsed
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\begin_layout Standard
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\backslash
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begin{rawhtml}
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\end_layout
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\begin_layout Standard
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\end_layout
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\begin_layout Standard
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<!-- main starts here -->
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\end_layout
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\begin_layout Standard
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\end_layout
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\begin_layout Standard
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<div id="main">
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\end_layout
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\begin_layout Standard
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\end_layout
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\begin_layout Standard
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\backslash
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end{rawhtml}
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Title
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Sicherer Chatten mit iChat
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\end_layout
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\begin_layout Standard
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Leider sind
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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\backslash
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htmladdnormallink{Pidgin}{http://pidgin.im}
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\end_layout
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\end_inset
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und
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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\backslash
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htmladdnormallink{Pidgin-Encryption}{http://pidgin-encrypt.sourceforge.net/}
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\end_layout
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\end_inset
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nicht f<>r Mac OS X verf<72>gbar.
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Deshalb kann an dieser Stelle das verschl<68>sselte Chatten unter Mac OS X
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nicht beschrieben werden.
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Stattdessen soll kurz erl<72>utert werden, wie die Sicherheit mit Apples eigenem
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Chat-Programm iChat gesteigert werden kann.
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\end_layout
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\begin_layout Subsection
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Verschl<EFBFBD>sseln des Verbindungsweges
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\end_layout
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\begin_layout Standard
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W<EFBFBD>hrend Pidgin eine Verschl<68>sselung von Endpunkt zu Endpunkt erlaubt, bieten
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andere Chatprogramme wenigstens die M<>glichkeit, den Transportweg zu sichern.
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Diese Art der Verschl<68>sselung nennt sich 'Transport Layer Security', kurz:
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TLS.
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Fr<46>her wurde dies als 'Secure Socket Layer' bezeichnet, so dass man in
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den Programmen h<>ufig noch die Bezeichnung SSL findet.
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\end_layout
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\begin_layout Standard
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Aktiviert man TLS, dann wird die Verbindung vom eigenen Chatprogramm zum
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Chatserver verschl<68>sselt.
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Man kann aber nie wissen, ob der Empf<70>nger der Nachricht ebenfalls diese
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Verschl<68>sselung eingeschaltet hat.
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Somit ist es m<>glich, dass die Nachricht die H<>lfte der Strecke ver- und
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die andere H<>lfte unverschl<68>sselt zur<75>ck legt.
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Eine Endpunkt zu Endpunkt Verschl<68>sselung ist also offensichtlich vorzuziehen.
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\end_layout
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\begin_layout Standard
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Ob eine TLS-Verschl<68>sselung im Einzelfall m<>glich ist, h<>ngt sehr davon
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ab, welches Chatprotokoll benutzt wird und ob der benutzte Server die Verschl<68>s
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selung unterst<73>tzt.
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Im Folgenden wird die Aktivierung von SSL in iChat mit einem
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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\backslash
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htmladdnormallink{Jabber}{http://de.wikipedia.org/wiki/Jabber}
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\end_layout
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\end_inset
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Account beschrieben.
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\end_layout
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\begin_layout Subsubsection
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Aktivieren von SSL in iChat f<>r einen Jabber Account
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\end_layout
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\begin_layout Standard
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In den Einstellungen von iChat f<>r den Account auf den Reiter 'Servereinstellung
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en' gehen und das H<>kchen '<27>ber SSL verbinden' anklicken.
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Der Port stellt sich automatisch auf 5223 ein.
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Dies ist der Port auf dem der Jabber Server <20>blicherweise die SSL-Verschl<68>sselu
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ng versteht.
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\end_layout
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\begin_layout Standard
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\begin_inset Float figure
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wide false
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sideways false
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status open
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\begin_layout Standard
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\begin_inset Graphics
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filename bilder/ichat_einstellungen_jabber_ssl.png
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\end_inset
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\end_layout
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\begin_layout Caption
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In iChat SSL aktivieren
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Standard
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\begin_inset Include \input{progress/zur_uebersicht.inc}
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preview false
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\end_inset
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\end_layout
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\end_body
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\end_document
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