What is Cryptosystem

This chapter introduces a framework for secure access to biomedical images. Biomedical images are acquired using a vast array of imaging techniques depending upon the specific application. A magnetic resonance spatial domain image is acquired by taking inverse weighted Fourier transform of raw frequency domain data generated by the modality. After correction, these images are stored in a standard format. The access to these stored images is typically subjected to authorization. Medical information in biomedical images needs to be protected in both stored form and in transmission. Encryption technologies are used to secure information whereas compression technologies are used to reduce the information without affecting the contents. In this chapter, a cryptocompression system is proposed which integrates both encryption and compression to fulfill the requirements of electronic protected health information records.