How to do digitize signature my sms

I'm sorry for my mistake grammar and e.t.c in my question ,because English is not my first language!!

But my question: I want digital signature sms and send it to another ,this means that digital signature to an sms and send it to another and retrieved it from other device. This is essential. please give me a solution for do this . thanks anybody.开发者_开发问答

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where I study about digital signature, and how to use it?

Wikipedia looks like a good starting point: http://en.wikipedia.org/wiki/Digital_signature

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Consider using this :-
http://www.ibm.com/developerworks/wireless/library/wi-extendj2me/

http://snippets.dzone.com/posts/show/5115

For Sending/Receiving the sms