how to send "Secure SMS" from iPhone -

i developing iphone application requires sending of "secure sms", able ot send sms within our application using mfmessagecomposeviewcontroller method, not getting on how can send sms securily text should encrypted client side(iphone) , should decrypted @ server side , vice versa.

any sample code or ideas appreciated.

thanks shiva.

http://septicus.com/products/opensource/ valuable resource let use openssl in cocoa environment.

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from main.m of sscrypt framework

// generate private key nsdata *privatekeydata = [sscrypto generatersaprivatekeywithlength:2048]; // generate public key private key data nsdata *publickeydata = [sscrypto generatersapublickeyfromprivatekey:privatekeydata]; 

and

crypto = [[sscrypto alloc] initwithpublickey:publickeydata privatekey:privatekeydata];  nsstring *topsecret = @"billy likes mandy"; [crypto setcleartextwithstring:topsecret];  nsdata *encryptedtextdata = [crypto encrypt]; nsdata *decryptedtextdata = [crypto decrypt];  nslog(@"top secret: %@", topsecret); nslog(@"encrypted: %@", [encryptedtextdata encodebase64]); nslog(@"decrypted: %s", [decryptedtextdata bytes]);  [crypto release];