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Lithursday: Difference between revisions

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== Current situation ==
== Current situation ==


Books used to be uploaded as [[File Synthesis|jpg-rars]] (rars hidden in jpg-files), but due to mootfaggotry this is no longer possible. <strike>In an attempt to circumvent this rage-invoking change, anon made a [[pFBind|file binder]] specifically for 4chan usage. Long live lithursday.</strike> lol blocked
Books used to be uploaded as [[File Synthesis|jpg-rars]] (rars hidden in jpg-files), but due to mootfaggotry <strike>this is no longer possible</strike> requires you to add padding to circumvent moot's filter. <strike>In an attempt to circumvent this rage-invoking change, anon made a [[pFBind|file binder]] specifically for 4chan usage. Long live lithursday.</strike> lol blocked.  Several [[File Synthesis#Blocked on 4chan|other workarounds]] are available.
 
As in the case of [[4chan.js]], moot's jpg-rar filter is easy to circumvent, since he isn't scanning the whole file, only the <strike>first and last 64 KB</strike> first 256 KB and last 64 KB.  All you generally need to do to get around it is add padding after the image (using several copies of the image will do) to push the beginning of the RAR file past the 256 KB threshold.  See instructions in the image below.


[[Image:Evading_the_4chan_Lithursday_Filter.png|thumb|The modern technique for posting embedded archives on 4chan, working as of May 23, 2011.]]
[[Image:Evading_the_4chan_Lithursday_Filter.png|thumb|The modern technique for posting embedded archives on 4chan, working as of May 23, 2011.]]
If or when moot fixes his filter, a number of fallbacks are available:
* Alter the magic number in the RAR file, for example by replacing "Rar!" with "Bar!".  Use a hex editor to do this so you don't make other unintentional changes to the file.
* Concatenate the image and file without compressing the file.  Since the file isn't an archive, it most likely won't be blocked.  Upon receiving such an image, you may need to do some work to extract it.  MP3 files will still work in some players even when attached to an image.  For other files, it's possible to extract the original file using a hex editor.  Alternatively, those of you not versed in Computer Science III may want to try [http://userscripts.org/scripts/show/40343 this] Greasemonkey script, which can detect the added data in images on 4chan and split the image back up into its original pieces.  Also useful for telling fake jpeg-rar books from real ones.  Do '''not''' use this technique to upload source code or HTML files as this may trigger the anti-[[4chan.js]] filter and get you banned.
* ChanGrouper (v1:[http://chngrpr.atspace.us/chngrpr.jar] v2:[http://chg2.atspace.us/chngrpr2.jar]) is a program similar to [[pFBind]] that is not currently blocked.  The ChanGrouper websites are often down; if you can't reach them now, try again later.
* The [http://goldaccount.byethost4.com/ 4chan Gold File Embedder] also offers similar functionality to the now-blocked [[pFBind]], but will be harder for moot to block because it uses an LSB-based steganography scheme to attach files, rather than appending them after the end of the image.  Also includes a web interface designed for 4chan which you can use by connecting to a proxy on localhost.  The original source code of the program is included; you can examine it by downloading the file and either renaming it to .zip or opening it in your favorite archiver.  Requires Java 5.0.
* [[Google]] will find you all sorts of other steganography utilities, some of them much harder to block.  One of the better ones is [http://steghide.sourceforge.net/ steghide].  The downside is that the hardest-to-block steganography tools typically require you to use a cover image at least 5-20 times the size of the hidden file.  This can run you up against 4chan's file size limit.


{{memes}}
{{memes}}


[[Category:Chans]]
[[Category:Chans]]

Revision as of 18:57, 23 May 2011

Lithursday is the main source of lulz for /b/tards on a Thursday. Unlike Caturday, posting anything on Lithursday wont turn you into a Furfag, but it will reduce your standing to that of a Basement-dweller.

An example of an extremely popular book

Lithursday consists of posting pictures of books that people have found interesting or useful. However it always degenerates into either manga discussions or becomes heavily trolled by /b/tards. Fight Club is posted every thread without fail.


Some times people post unfunny or shooped pictures on Lithursday. Doing so is strictly forbidden, as Lithursday is serious business

Some argue that Lithursday should be replaced with ZonDay, after the Lulzy Events of 7/26.


History

Lithursday was created At least 100 years ago, on the 4chan b board. Due to the age of the board, many Old memes can often be found, including but not limited to Cockmongler

Cockmongler's Autobiography

, Computer Science III

The ultimate guide to 1337 HAX0RZ

and mudkipz.

Since those early days, Lithursay has become a day to be remembered for great information on Anal Techniques.

How to please your Man


Current situation

Books used to be uploaded as jpg-rars (rars hidden in jpg-files), but due to mootfaggotry this is no longer possible requires you to add padding to circumvent moot's filter. In an attempt to circumvent this rage-invoking change, anon made a file binder specifically for 4chan usage. Long live lithursday. lol blocked. Several other workarounds are available.

The modern technique for posting embedded archives on 4chan, working as of May 23, 2011.

Lithursday is part of a series on

Memes

Visit the Memes Portal for complete coverage.

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