How to change alphabet to number in security code image?

Defcon · Regular Joined: Mar 10, 2005 Posts: 90

Hye all! I got some question here about security code login. How to change alphabet to number in security code image on login block?

thanxs

Guardian2003 · Posted: Mon Apr 30, 2007 2:54 am

Open includes/class.php-captcha.php
Around line 59 you will see

Code:

define('CAPTCHA_CHAR_SET', ''); // defaults to A-Z

Change that to

Code:

define('CAPTCHA_CHAR_SET', '1,2,3,4,5,6,7,8,9,0'); // defaults to A-Z

I would not recommend using double digits as this may force some number off the page and the user wouldnt be able to see them. Also, when using numerical captcha you are limited to 1 in 10 characters per digit as against using alphabetical characters where there is a 1 in 26 possibility per character - in simple terms, the alpha sequence offers more permuations ans is therefore more secure than using numerics.

Defcon · Regular Joined: Mar 10, 2005 Posts: 90

Guardian2003 wrote:

Open includes/class.php-captcha.php
Around line 59 you will see

Code:

define('CAPTCHA_CHAR_SET', ''); // defaults to A-Z

Change that to

Code:

define('CAPTCHA_CHAR_SET', '1,2,3,4,5,6,7,8,9,0'); // defaults to A-Z

I would not recommend using double digits as this may force some number off the page and the user wouldnt be able to see them. Also, when using numerical captcha you are limited to 1 in 10 characters per digit as against using alphabetical characters where there is a 1 in 26 possibility per character - in simple terms, the alpha sequence offers more permuations ans is therefore more secure than using numerics.

Ahaaa... thanxs Guardian2003 hhuhuhuhu

Guardian2003 · Posted: Mon Apr 30, 2007 8:07 am

No problem, happy to help.

jlajax · Posted: Wed Dec 17, 2008 6:06 pm

Guardian2003 wrote:

Open includes/class.php-captcha.php
Around line 59 you will see

Code:

define('CAPTCHA_CHAR_SET', ''); // defaults to A-Z

Change that to

Code:

define('CAPTCHA_CHAR_SET', '1,2,3,4,5,6,7,8,9,0'); // defaults to A-Z

Quote:

CAPTCHA_CHAR_SET', '1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I.J.K.L.M.N.O.P.Q.R.S.T.U.V.W.X.Y.Z'); // defaults to A-Z

Before I try this Will it work? The goal being to display a combination of letters and numbers in the security code. Seems to me this increases options increasing security.

Thanks guys

RavensScripts

Guardian2003 · Posted: Thu Dec 18, 2008 1:43 am

Yes if you seperate them with a 'comma' not a 'stop' but I would leave out the zero and letter 'o' to avoid confusion.

jlajax · Posted: Thu Dec 18, 2008 2:39 am

Many Thanks!

RavensScripts