Abstract :
The confidentiality of an SMS message is an important requirement for today's society to protect their privacy from unauthorized persons. To solve the needs of an application capable of meeting the needs of the community where this application can encrypt SMS messages in order not to be known by others Sms sms application works by way of people who send SMS and receive sms must have the same application, SMS sending application using method caesar cipher repair application using waterfall method, application made with eclipse program, end result of application this is a security sms application which where if fellow users have the same application then it can encrypt and decrypt messages sent and received.