SMS plays an important role in mobile communication systems. The sending side is acting like as a server for the receiving side that receives short message service at the receiving side. SMS does not incorporate a procedure to accord security for the text sent as data. A majority of the applications for mobile devices are designed and implemented without taking security into account. SMS messages are not normally encrypted by default. Confidentiality is the notion of making sure that data is not made accessible or exposed to unauthorized people. Encryption is the main approach to confidentiality. Both symmetric and asymmetric encryption can be employed. As confidentiality was the original purpose of cryptology, this chapter is introduced as a data confidentiality approach to SMS on Android. It encompasses SMS network architecture as well as cryptographic protocols as theory background and it also deals with design, implementation, and confidentiality assessment of RC4 stream cipher for SMS data confidentiality on mobile networks.
Part of the book: Intelligent System and Computing