You may go search for the stream ciphers for gdm: A5/1 ,A5/2 and A5/3. They are stream ciphers implemented using linear feed back shift registets. And as i remember A5/3 was attacked  in the early 2000.

Dear Selvan,

Lot of work is going on to encrypt SMS. The following indicates latest developments.

TextSecure is an advanced end-to-end encryption protocol as well as a free and open-source encrypted instant messaging application for Android.

SMS Encryption 3.3 is another application which allows to send secure SMS. This is available at: http://forum.xda-developers.com/android/apps-games/app-sms-encryption-2-5-app-allows-to-t3008864

You may also read the attached file.

AR Reddy

BLOWFISH ALGORITHM

Nowadays cryptography becomes a numerous techniques for

data security. There are two methods for data

encryption,one of them uses one key for encryption and decryption, it's

known as symmetric cryptography like DES and Blowfish.

The other method uses two keys for

encryption and decryption it is a symmetric cryptography like RSA Algorithm

Blowfish Encryption Algorithm

Blowfish [15] is a 64bit cipher and its key length extended from 32 bits to 448 bits, it has 16 rounds and generates the key

BLOWFISH ALGORITHM

Nowadays cryptography becomes a numerous techniques for

data security. There are two methods for data

encryption,one of them uses one key for encryption and decryption, it's

known as symmetric cryptography like DES and Blowfish.

The other method uses two keys for

encryption and decryption it is a symmetric cryptography like RSA Algorithm

Blowfish Encryption Algorithm

Blowfish [15] is a 64bit cipher and its key length extended rom 32 bits to 448 bits, it has 16 rounds and generates the key dependent SBoxes

.

If you are asking for the standards: no end-to-end encryption is used. Only the encryption to secure the radio connection between your mobile and the base station is applied.  But that does not make your SMS unreadable to your provider...

As others already pointed out, various solution exist to add end-to-end encryption for SMS. Our group produced solutions: see Schröder (2012) on https://cosec.bit.uni-bonn.de/science/publications/pub-ia/#sch12b and its reference Berndt (2010).

Dear brother

You can exploits the AES-128 and QKD for key preparation. I thank if you can to demonstrate such integration anew field of SMS encrypted will be appeared. Good Luck

Thanks Mr. Omer.

Short messages to and from applications are not only based on SS7 but also on an IP protocol (such as SMPP). One of my master students secured the Java SMPP framework "smppapi" with the cryptosystem "SecureString 2.0". You find her thesis at https://dx.doi.org/10.13140/2.1.4680.8641

for short message service Encryption Using AES Algorithm on Android

Thanks Mr. Günter Fahrnberger.  The paper you have linked is not in English.  Could you please provide the English version of the paper, if possible?

Good wishes to you and your students in your research works.

Regards.

There is not any cryptography algorithm for sending SMS in mobile communication.

i support majid. if any algorithm used all the service providers need to use same algorithm. suppose if it is symmetric encryption, how the same keys are provided by different providers

1- SMS does not encrypt in GSM . 

Related to key management in GSM, this is why they using from IV.

I too, like Vijay Ananda and Majid Bakhtiari believed that our smss travel plain without encryption but the down votes force me to think that may be it is not the case!

WhatsApp support end to end encryption, I know (though dont know what algo is used!). Gmail uses PGP (IDEA) but, sms?????Still doubtful!

JCCC and Soft Input Decryption (SID)

Again: SMS are not end-to-end encrypted or authenticated.

One may add encryption with the one or other solution; but that was not the question.

Other services provide end-to-end protection; but that was not the question.

Surely, the radio signal is encrypted between mobile and base station; but that merely presents eavesdropping or misuse by third parties. The service provider sees SMS in plain text.