In this book, a presentation in a wide scope for the construction of one of practical rateless codes which is called Luby transform (LT) code is presented. The contribution of this work is the design of a new version for the Luby transform code. A modified encoding-decoding approaches have been constructed such that the code becomes suitable for short data length files. With such improvements, the code now is suitable for applications that used a few number of data packets. Its efficiency appears in high successful decoding and less processing time compared to those that used in conventional design of LT codes.