User:Davidgothberg

David is semi-retired from Wikipedia due to both personal reasons and way too much wikistress. I only log in and edit occasionally. I do check my messages here from time to time, but don't expect any answers or work from me.

last season . This user is a participant in the WikiProject Cryptography.   while( !wikipedia && !dance )       This user is a programmer. This user dances waltz, samba, jitterbug and more. sv Jag talar svenska som modersmål. en-4 This user is able to contribute with a near-native level of English. de-2 Dieser Benutzer hat fortgeschrittene Deutschkenntnisse.

David Göthberg

My work at Wikipedia

I mainly program templates and edit articles about cryptography. I mostly work on the English Wikipedia but sometimes I fix stuff on the Swedish and German Wikipedias and on Meta too.

About me

I am a native of

I like Wikipedia since it has provided me with answers to many of my questions during years. So naturally I wanted to join in and make Wikipedia even better.

I think Wikipedia is like the web on steroids. And I think that Wikipedia has become the best encyclopaedia the human race has ever seen. Apart from the web itself that is. But hey, Wikipedia is a part of the web...

I started editing Wikipedia in September 2004 when I saw a red link to

As usual in Wikipedia if you want to communicate with a user (me in this case) leave a message on my talk page. As you might know Wikipedia automatically informs me of any new messages/edits on my talk page when I log in.

    .../David Göthberg

Articles and pages I started out

• Filmjölk - A kind of food that we eat in Sweden and some other countries. Unfortunately the article came under extensive attack by some Finns so I gave up on it and left it. However the wiki process seems to work, over time other editors have made it better and in the end the attackers gave up.
• Hash list - A method used to detect errors in data such as files in for instance p2p networks.
• Merkle hash tree - Another method used to detect errors in data such as files in for instance p2p networks.
• Naprapathy
  - A kind of manual medicine similar to chiropractic.
• One-way compression function - Well, really a merger and major rework and extension of three small articles.
• Merkle-Damgård construction
  - Based on a section that was in two other articles. I cut them out and reworked and extended the text.
• Ivan Damgård - Translated the french article using www.qwika.com.
• Key strengthening
  - Cryptographic methods to make weak keys such as passwords stronger.
• Clock drift - Well, really a major rework and extension of the original small and confused article.
• Keystream - A concept in cryptography.
• Shared secret - Unbelievable that such a common and simple concept in cryptography did not already have an article.
• Wikipedia:Ambox CSS classes - A Wikipedia how-to-guide related to the {{ambox
  }} project.
• Wikipedia:Line break handling
  - The definitive "how-to guide" about how to handle word wraps (line breaks) at Wikipedia.
• Wikipedia:Editnotice – About the editnotice system.
• Wikipedia:MediaWiki messages – The central page to discuss MediaWiki interface messages.
• Wikipedia:Secure server – About the Wikimedia secure server.
• MediaWiki:Accountcreator.css, MediaWiki:Ownuserspace.css – The global CSS-files loaded for accountcreators and when a user edits his/her own user or user talk page. Used in the editnotice system.

Articles I have made images for

• Hash list
• Hash tree
• Hash function - Later remade into svg-format by another user.
• Cryptographic hash function
• Hash table - Later remade into svg-format by another user.
• One-way compression function
• Merkle-Damgård construction
• Public-key cryptography - Two of these images have been reused in a book published by a big US bank, in the chapter where they explain how their security works. They sent me a copy, it looks very nice in my bookshelf.
• Avalanche effect

Templates I made

Templates I created or done major reworks of. Some have of course been teamworks. Every now and then people ask "Why so many red links here?" Well, they were not deleted because they were bad, but over time these functions have been implemented in other ways. For instance, many of these functions have now been implemented in the MediaWiki software itself.

2005:

• {{User WikiProject Cryptography}} – The userbox for members of the WikiProject Cryptography.

2006:

• {{Cryptography portal}} – Box that advertises the Cryptography portal.
• {{
  Crypto navbox
  }} – The main crypto navbox.
• {{
  Crypto classical
  }} – The specialised crypto navboxes.
• {{
  Participant
  }}.
• {{
  bullet
  }} - For dotted lists. (Used on 146,000 pages, December 2009.)

2007:

• {{nowraplinks}} and {{nowraplinks end}} – Prevents line wrapping in links only. We also added the CSS class "nowraplinks" to common.css. That class is now used in most navigation boxes.
• {{nowrap begin}}, {{nowrap end}}, {{wrap}}, {{·wrap}}, {{·w}}, {{•wrap}}, {{•w}}, {{–wrap}}, {{–w}}, {{!wrap}} and {{!w}} – Prevents wraps in both text and links. For the really tricky wrapping cases when you need full control, for instance in very complex long link lists. (Used on 251,000 pages, December 2009.)
• {{ambox}}, {{ambox/core}}, {{tmbox}}, {{tmbox/core}}, {{imbox}}, {{cmbox}}, {{ombox}}, {{ombox/core}}, {{mbox}}, {{fmbox}} and {{dmbox}} – The meta templates used to create article/talk/image/category/other pages message boxes such as {{wikify}} etc. (Ambox: 723,000 pages, tmbox: 732,000 pages, imbox: 877,000 pages, December 2009.)
• {{Template doc page}} – Simplifies template documentation.
• {{pp-meta}} – The meta template for the protection message boxes.

2008:

• {{
  976,000
  pages, December 2009.)
• {{notice}} and {{caution}} – Rework and clean-up. Now use the mbox styles.
• {{
  tlf
  }} – For template documentation.
• {{px}} – Helps other templates to process image size parameters.
• {{
  ifempty
  }} – Helps detect empty parameters and fall back to default values.
• {{protected generic image name}} – Image page description etc for the placeholder images.
• {{
  high-risk}}, {{used in system
  }} – Can be put at the top of the documentation for any high-use or high-risk template.
• {{example files}} – Explains when to use which example image.
• {{editnotice pagename}}, {{editnotice talkpagename}} – Return the pagename for the editnotice for the current page, and the talkpage name of that editnotice.

2009:

• {{
  string templates see also
  }} – Easy to use string length templates. And most of them are very efficient.
• {{filmography table head}} – For tables made by the Wikipedia:WikiProject Actors and Filmmakers.
• {{
  number of archives}}, {{number of archives/core
  }} – Returns how many archive pages a page has.
• {{
  if pagename}}, {{if pagename multi}}, {{pagename detect see also
  }} – Pagename-detection and manipulation, works in all namespaces. (If pagename: 826,000 pages, December 2009.)
• {{search link}} – Creates a link to the Wikipedia search. I just did some of the work.
• {{
  cat handler/blacklist
  }} – To handle category suppression in other templates. (Used on 826,000 pages, December 2009.)
• {{ifparadef}}, {{ifparadef full}} – To help detect undefined, empty and non-empty parameters. I just did some of the work.
• {{sec link}}, {{sec link auto}}, {{sec link image}}, {{sec link/secure url}}, {{sec link/normal url}}, {{sec link/normal link}}, {{sec link/text}}, {{sec link see also}} – To handle links to the secure server.
• {{script doc auto}}, {{script doc auto/core}}, {{script doc auto/core2}} – The small green doc box on top of .js and .css pages that automatically links to their documentation.

2010:

• {{editnotice load}}, {{editnotice load/core}} – Loads and displays the editnotices. Based on my old {{editnotice loader}}.
• {{test-mode}} – For advanced testing of templates.
• {{skin-file disambig}} – Fall-back system message for the Special:MyPage/skin.css links.
• {{IP-user other}}, {{IP-user other/core}} – Helps other templates detect if they are on an IP-user page.
• {{print version}} – For modifying template appearance when exporting a page to PDF or books.
• MediaWiki:Titleblacklist-custom-print – The system message seen when trying to create or edit /Print subpages.

2011:

• {{check file on delete}}, {{check page on delete}} – Called from the image and page delete system messages. Checks if a page is protected and displays a warning message when an admin tries to delete that page.

User scripts I made

• User:Davidgothberg/clock – Puts an UTC clock in the upper right corner of all pages. And has links to purge the page and to edit section 0.
• User:Davidgothberg/newmessageshistory – Added a "history" link to the old "You have new messages" box. Doesn't work anymore, since now we instead have the excellent alerts and notices buttons on top of page with that function and much more.

<noinclude>

{{documentation}}
<!-- Categories go on the /doc subpage, and interwikis go on Wikidata. -->
</noinclude>


{{testcases notice}}

=== Testing {{tl|x/sandbox}} ===

<pre>
{{x/sandbox}}
</pre>


<code><nowiki> </nowiki></code>

<pre style="overflow: auto;">
</pre>

{{main other 
| 
| :::::This template should only be used on articles.
| <!-- Don't categorise when not in main (article) space. -->
}}

your personal [[Special:Mypage/vector.css|/vector.css]]
your personal [[Special:Mypage/vector.js|/vector.js]]
then [[Wikipedia:Bypass your cache|bypass]] your browser cache

My other Wikipedia accounts

I use unified login thus any account on any other Wikipedia or MediaWiki project with the same name usually is me too.

• commons:User:Davidgothberg
• meta:User:Davidgothberg – Recent changes for meta:Wikimedia Sverige.
• mw:User:Davidgothberg
• testwiki:User:Davidgothberg

Below are my alternate accounts here at the English Wikipedia. So far I have only used them for some testing. I can also use them if I need to log in and edit from an insecure public computer or similar. (My main account has its own password, and I only log in to my main account from my computer at home, for security reasons.)

• talk · contribs
  ) – Proper spelling of my name.
• talk · contribs
  ) – Created by mistake by another user who then gave it to me.
• Bretinnen908 (talk · contribs) – I needed to see what happens when creating a new account so I could update some of the system stuff.

Images I created and uploaded

Some of these pictures have of course been teamworks, some are just minor edits, and some have been reused in printed books.

• 
  A hash list with a top hash
• 
  A binary hash tree
• 
  A typical hash function at work
• 
  A typical hash function at work
• 
  A hash table
• 
  A hash table with a hash collision resolved by chaining
• 
  A hash table with a hash collision resolved by open addressing (linear probing)
• 
  The Davies-Meyer hash construct
• 
  The Matyas-Meyer-Oseas hash construct
• 
  The Miyaguchi-Preneel hash construct
• 
  The Merkle-Damgard hash construction
• 
  The Merkle-Damgard hash construction
• 
  A big random number is used to make a public-key pair.
• 
  Anyone can encrypt by using the public key, but only the owner of the private key can decrypt the message.
• 
  The owner of the private key can sign a message, and anyone can verify the signature by using the public key.
• 
  By combining your own private key with the other users public key you can calculate a shared secret that only you two know.
• 
  The

  SHA1

  hash function exhibits good avalanche effect. When a single bit is changed the hash sum becomes totally different.
• 
  Made as a suggestion for the discussion on Template talk:Navigation bar.
• 
  A one-way compression function.
• 
  A typical modern block cipher.
• 
  Merge/split/transwiki image for the article message boxes. Derived from a Tango project icon, I just made this version with purple colour.
• 
  Merge/split/transwiki image for the article message boxes. Derived from a Tango project icon, I just made this version with purple colour.
• 
  Merge/split/transwiki image for the article message boxes.
• 
  Light blue info icon for the article message boxes. I didn't make this image, I just made this version with new colours.
• 
  I built this clock by reusing parts from images others had made. And I made it red.
• 
  A new free "current event" image. A team work, and a combination of some existing images. So I just did a little part.
• 
  A new free "current event in sports/soccer" image
• 
  Wikipedia didn't have any decent couple dancing icon, so I brushed up an old image from my dance web master days. (Some non-Wikipedian friends helped me with this one.)
• 
  A SVG version of the placeholder image File:Image.gif.
• 
  Delete icon suggestion for the article message boxes.
• 
  License icon suggestion for the image message boxes. Just a modification of another image, but with proper padding for the {{imbox}} and transparent background.
• 
  Soft chequered background for transparent images on image pages and galleries like this.
• 
  Image for the {{documentation subpage}} message box. Derived from a Tango project icon, I just made this version with green colour.
• 
  Mirrored version of . For use on Wikipedia projects that use a language written from right to left (RTL). Requested by a Persian admin.
• 
  Mirrored version of
• 
  Mirrored version of
• 
  Mirrored version of
• 
  Mirrored version of
• 
  Screenshot showing the <tt>, <code>, <pre> and <source> tag bug.
• 
  Blue version of .
• 
  Blue shiny softer version of .