Lossless compression schemes with secure transmission play a key role in telemedicine applications that help in accurate diagnosis and research. Traditional cryptographic algorithms for data security are  not fast enough to process vast amount of data. Hence  a novel  Secured lossless compression approach proposed in this paper is  based on reversible integer   wavelet transform, region based modified SPIHT algorithm , new modified runlength coding for character representation and selective bit scrambling. The use of the lifting scheme allows to generate truly lossless integer-to-integer wavelet transforms. Images are compressed/decompressed by region  based modified SPIHT algorithm and   the proposed modified runlength coding greatly improves the compression performance and also increases the  security level.  This   work employs scrambling method which is fast, simple to implement and it also provides security. Lossless compression ratios and distortion performance of this proposed method are found to be better than other lossless  techniques.

Keywords: Region based modified SPIHT algorithm, lifting scheme, lossless compression, reversible integer wavelet transform, secure transmission, selective bit scrambling, modified runlength coding.