This blog is retired.

Archive for March, 2008

“Raed taht” doesn’t work

Tuesday, March 25th, 2008

Acodricng to raserech at Cmaribgde uitisnevry, it dsoen’t mtaetr waht oredr the lteerts in a wrod are …

Can we use word mangling in captcha software? Unfortunately, no. According to the report of Dmytry Lavrov, “in many cases computer reads taht btteer tahn hmaun cluod”.

Trackback Confirmation plugin for WordPress

Sunday, March 16th, 2008

Finally, I’ve released yet another but unique anti-spam plugin for WordPress. The formal description:

Publishing of a trackback or a pingback is postponed till someone, usually a trackback author, approves it. Trackbacks which are not approved in 20 hours are automatically deleted. It stops spam from bots and allows trackbacks from the real humans.

A better description is probably a description by an use case:

* Alice has Trackback Confirmation installed.
* Bob has written a blog post with a link to Alice’s blog post.
* Bob checks if a trackback appears in the Alice’s blog.
* No, the trackback hasn’t appeared. But Bob notices the link “approve trackbacks”.
* He follows the links, finds his trackback and approves it.
* Now Alice’s blog links to the Bob’s post.

It’s just a web 2.0 style of trackback moderation. Comments are approved not by the blog’s author, but by the blog’s visitors.


How do you spell “CAPTCHA”?

Tuesday, March 4th, 2008

Once, browsing the server’s log file, I noticed a visit from Google. Someone mistyped the word “captcha” as “capcha”, and by accident I mistypes this word in a post too. Now I decided to look at the popularity of possible misspells.

* captcha — about 46,700,000
* capcha — about 579,000 (Google suggests the correct spelling.)
* captca — about 3,300 (Google suggests the correct spelling.)
* kaptcha — about 3,920 (the project name)
* kapcha — about 16,600 (the project name, not related to captchas)
* kaptca — about 228 (Mostly login names. Google suggest the correct spelling.)

According to Google, 1.2% of people misspell “captcha” as “capcha”. Other possible ways of misspell are not popular.

The second experiment was with Technorati. It returned 5,378 results for “captcha” and 86 results for “capcha”. Surprisingly, the percent grows: 1.6%.