User:AalekhN/GSoC proposal 2014

Multilingual, usable and effective captchas

 * Public URL: https://www.mediawiki.org/wiki/User:AalekhN/GSoC_proposal_2014
 * Bugzilla report:
 * https://bugzilla.wikimedia.org/show_bug.cgi?id=32695
 * https://bugzilla.wikimedia.org/show_bug.cgi?id=5309


 * Announcement: https://www.mediawiki.org/wiki/Summer_of_Code_2014#Multilingual.2C_usable_and_effective_captchas.

Name and contact information
Name:Aalekh Nigam Email:aalekh1993@rediffmail.com IRC or IM networks/handle(s):aalekhN Location:New Delhi,India Timezone: Kolkata,INDIA, UTC+5:30 Typical working hours:12:00PM to 3:00AM until August,05:00PM to 3:00PM after August

Synopsis
Current CAPTCHAs implemented in many Wikimedia Projects are mostly broken, lacks localization and are many times vulnerable.This project aims to design an Multilingual, usable and effective captcha,which will be much more secure (difficult for bots to solve) ,user friendly (easier for humans to solve) and Multilingual for Mediawiki Projects...the new solution will also be useful for Blind and Visually Impaired users.

Scope of Work
There could be three best approaches to produce required result for the project:


 * Captcha on the basis of Selection of Particular Object: The following type of image will be shown as follow:

the only possible answer to given captcha is selecting images in increasing numerical order as shown below:

other possible questions for the captchas could be "Select the images in which man is wearing sunglasses?" as shown below:

An demo demostrating raw implementation of the given type of captcha is given here.If the captcha combination gets wrong ;captcha reloads itself and shows captcha with different images.

the answer to given question will be shown as follow: for better security issue I plan to provide 8 options for the captcha rather than 4 options.
 * Ask User to click on the same image as provided:The Question for the given type of captcha looks like:

Now when audio ask's user to select number "0" our user will use arrow key to move across different blocks like a slide show....with different voice speaking out the options and pressing enter to select the number spoken as option....hence verifying that the user is human.....although the above shown image is visual equivalent the actual image visible will be: based upon the user resarch conducted i would make audio captcha system audio for question two times....pause for 5 seconds then give a new captcha to the user if the user does not click on any option or selects the wrong option .....this can help us with bot attacks ....we can reserve a key lets say "a" as a virtual cursor for the users to be able to reload the captcha if the sound is not audible to the users.
 * )For blind and visually impaired users:We can use and audio captcha system which ask user to select the number simultaneously as it is asked in the audio.For example the visual equivalent of the audio asked by the user will be :

Deliverables
The Project aims to develop an effective captcha with the use of Wikimedia Commons API ,which would make Wikimedia Commons act as an database for our captcha images.
 * Aim to develop a proper indexing system for the images to be used for the captcha ...which would sort out the images that are not friendly to the user.
 * Develop effect's for captcha with the use of PHP's GD library.
 * Develop an user friendly audio captcha for Blind and Visually Impaired users .... by introducing various virtual cursors to the scan reader.