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		<id>http://fileformats.archiveteam.org/index.php?action=history&amp;feed=atom&amp;title=Pre-2017_Skype_chatsync</id>
		<title>Pre-2017 Skype chatsync - Revision history</title>
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		<updated>2026-04-21T03:21:31Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>http://fileformats.archiveteam.org/index.php?title=Pre-2017_Skype_chatsync&amp;diff=31112&amp;oldid=prev</id>
		<title>Effect2: Made more clear that this is not the only copy of everything; minor change in wording; fixed typo</title>
		<link rel="alternate" type="text/html" href="http://fileformats.archiveteam.org/index.php?title=Pre-2017_Skype_chatsync&amp;diff=31112&amp;oldid=prev"/>
				<updated>2019-04-12T03:28:34Z</updated>
		
		<summary type="html">&lt;p&gt;Made more clear that this is not the only copy of everything; minor change in wording; fixed typo&lt;/p&gt;
&lt;table class='diff diff-contentalign-left'&gt;
				&lt;col class='diff-marker' /&gt;
				&lt;col class='diff-content' /&gt;
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			&lt;tr valign='top'&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 03:28, 12 April 2019&lt;/td&gt;
			&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 6:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 6:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;}}&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;Before a change some time in or before 2017&amp;lt;ref&amp;gt;Message at top of http://fouryears.eu/2015/01/22/skype-removed-messages/&amp;lt;/ref&amp;gt;, the [[Telephony|VoIP]] + [[E-Mail,_newsgroups,_and_forums#Chat.2C_Texting_and_Instant_Messaging|chat]] program [[Skype]] stored its message history in several binary files collected under a directory &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;names &lt;/del&gt;&amp;quot;'''chatsync'''&amp;quot;. These are particularly useful, especially in comparison to [[Skype main.db|the main Skype log/history database]], because they purportedly contain messages that had been &amp;quot;deleted&amp;quot; by the client. Under the &amp;quot;chatsync&amp;quot; directory, the individual files, which have the extension .dat and a main name consisting of 8 bytes represented in hexadecimal (to make 16 ASCII characters), are placed into directories named after the first two characters (i.e. the first byte, as represented in hexadecimal) of their name.&amp;lt;ref name=&amp;quot;effect2_personal&amp;quot;&amp;gt;A Skype database, last modified late 2014, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;associated with &lt;/del&gt;[[User:Effect2]]&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;Before a change some time in or before 2017&amp;lt;ref&amp;gt;Message at top of http://fouryears.eu/2015/01/22/skype-removed-messages/&amp;lt;/ref&amp;gt;, the [[Telephony|VoIP]] + [[E-Mail,_newsgroups,_and_forums#Chat.2C_Texting_and_Instant_Messaging|chat]] program [[Skype]] stored &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;a copy of &lt;/ins&gt;its message history in several binary files collected under a directory &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;named &lt;/ins&gt;&amp;quot;'''chatsync'''&amp;quot;. These are particularly useful, especially in comparison to [[Skype main.db|the main Skype log/history database]], because they purportedly contain messages that had been &amp;quot;deleted&amp;quot; by the client. Under the &amp;quot;chatsync&amp;quot; directory, the individual files, which have the extension .dat and a main name consisting of 8 bytes represented in hexadecimal (to make 16 ASCII characters), are placed into directories named after the first two characters (i.e. the first byte, as represented in hexadecimal) of their name.&amp;lt;ref name=&amp;quot;effect2_personal&amp;quot;&amp;gt;A Skype database, last modified late 2014, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;from an installation by &lt;/ins&gt;[[User:Effect2]]&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;== Identification ==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;== Identification ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Effect2</name></author>	</entry>

	<entry>
		<id>http://fileformats.archiveteam.org/index.php?title=Pre-2017_Skype_chatsync&amp;diff=31107&amp;oldid=prev</id>
		<title>Effect2: Created page with &quot;{{FormatInfo |formattype=electronic |subcat=Telephony |extension={{ext|dat}} |released=2003&lt;ref&gt;Wikipedia:Skype&lt;/ref&gt; }}  Before a change some time in or before 2017&lt;ref&gt;M...&quot;</title>
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				<updated>2019-04-11T04:20:19Z</updated>
		
		<summary type="html">&lt;p&gt;Created page with &amp;quot;{{FormatInfo |formattype=electronic |subcat=Telephony |extension={{ext|dat}} |released=2003&amp;lt;ref&amp;gt;&lt;a href=&quot;http://en.wikipedia.org/wiki/Skype&quot; class=&quot;extiw&quot; title=&quot;wikipedia:Skype&quot;&gt;Wikipedia:Skype&lt;/a&gt;&amp;lt;/ref&amp;gt; }}  Before a change some time in or before 2017&amp;lt;ref&amp;gt;M...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{FormatInfo&lt;br /&gt;
|formattype=electronic&lt;br /&gt;
|subcat=Telephony&lt;br /&gt;
|extension={{ext|dat}}&lt;br /&gt;
|released=2003&amp;lt;ref&amp;gt;[[Wikipedia:Skype]]&amp;lt;/ref&amp;gt;&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
Before a change some time in or before 2017&amp;lt;ref&amp;gt;Message at top of http://fouryears.eu/2015/01/22/skype-removed-messages/&amp;lt;/ref&amp;gt;, the [[Telephony|VoIP]] + [[E-Mail,_newsgroups,_and_forums#Chat.2C_Texting_and_Instant_Messaging|chat]] program [[Skype]] stored its message history in several binary files collected under a directory names &amp;quot;'''chatsync'''&amp;quot;. These are particularly useful, especially in comparison to [[Skype main.db|the main Skype log/history database]], because they purportedly contain messages that had been &amp;quot;deleted&amp;quot; by the client. Under the &amp;quot;chatsync&amp;quot; directory, the individual files, which have the extension .dat and a main name consisting of 8 bytes represented in hexadecimal (to make 16 ASCII characters), are placed into directories named after the first two characters (i.e. the first byte, as represented in hexadecimal) of their name.&amp;lt;ref name=&amp;quot;effect2_personal&amp;quot;&amp;gt;A Skype database, last modified late 2014, associated with [[User:Effect2]]&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Identification ==&lt;br /&gt;
.dat files appear to have the magic number {{magic|73 43 64 72 07}}, as represented in hexadecimal.&amp;lt;ref&amp;gt;https://www.hackerfactor.com/blog/index.php?/archives/231-Skype-Logs.html#c1066&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Links ==&lt;br /&gt;
* [https://pypi.org/project/skype-chatsync-reader/]: A [[Python]] tool (Pip package name skype-chatsync-reader) capable of reading the files (this does not seem to work with &amp;lt;ref name=&amp;quot;effect2_personal&amp;quot; /&amp;gt;; it is possible that the change was not even around 2017 but rather pre-2014)&lt;br /&gt;
** [https://github.com/konstantint/skype-chatsync-reader GitHub page]&lt;br /&gt;
** [http://fouryears.eu/2015/01/22/skype-removed-messages/ An associated blog post]&lt;br /&gt;
* [https://www.hackerfactor.com/blog/index.php?/archives/231-Skype-Logs.html#c1066 An attempt to document the structure of the .dat format]&lt;br /&gt;
* [https://web.archive.org/web/20100911132415/http://itsecuritylab.eu/index.php/2010/08/20/skype-dat-reader-is-updated/ Another program for reading .dat files]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&amp;lt;references /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Effect2</name></author>	</entry>

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