How to add digital signature image to pdf in ios? - iphone

Can anybody help me to solve this problem.
I am working on iphone development. This is new for me.
I need to generate a pdf with digital signature. I don't have any idea about this . I have googled past 1 week, still i am not able to crack this problem.
Please can anybody explain the step by step procedure or provide me some source code example.
Also provide me some good links.

see this may be help you :Convert an image to pdf

Please have a look at this.
http://osxdaily.com/2011/08/17/sign-pdf-with-digital-signature-mac-os-x/
----or------
http://layersmagazine.com/digital-signatures-acrobat8.html
hope this may Help you

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issues when classifying enterotypes on http://enterotypes.org/

I would like to assign enterotypes for my metagenomic data by using the classifier on http://enterotypes.org/
I used the same format required on the website, but this submission still got an errors.
I am going to contact to author but I could not find any email on this site.
Anyone could help me? Thank you so much for your help.
sincerely yours,
Input format.
The error.
I also had some troubles uploading tables, try adding an empty "tab" in the 1st row (header) so that all columns align. I made some trials and it worked for me, but don't ask me why. I agree that some support in the website would be nicely appreciated.

Image Editing Issue

I am working on an app with have requirement to give "Droste Effects" on image.i did search on Google more but not find programming solution for this effects.the effect example in there below.
http://apping.me/ios/4eb514ba8491783f5b0001e2/droste+vision.html
http://www.pmavridis.com/iDroste/iDroste.html
Please provide me suggestion or any tutorials link. How i will do that task?.Thanks in advance.
The Droste effect is a trick made with some intense mathematics and a recursive function. Please read http://www.josleys.com/article_show.php?id=82. If you don't know about recursion please read up http://en.wikipedia.org/wiki/Recursion. Since your request is very specific I doubt there will be many people who happen to have a Droste effect code written in the iphone programming langauge, but the links above should help you understand the math behind creating your own. Good luck.

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Captch Integration

Is there any particular way to integrate Captch code validation in iPhone application?
is this possible to create captcha? (with or without web-service / any API)
If any kind of external library or any source is required to be imported, then also please let me know.
Any kind of link or source code is available then please suggest me.
Also suggest from where to start to do this, if possible.
Thanks in advance.
I know you probably don't want to hear this, but why do you need captcha on iPhone? It's completely useless since there are no bots or something.
But if you really need it then make some image with white background and then use this code
http://iphonesdksnippets.com/post/2009/05/05/Add-text-to-image-%28UIImage%29.aspx
to add text to the image... once you'll have this, then just check if the entered string is equal to the randomly generated one on the image and you are good to go.
I didn't find any libraries which could be used as a captcha, so I think this is probably the best solution right now.
Cya,
Nick