Safe Transfert of Medical Images by Conjoined Coding : Selective Encryption by AES Using the Stream Cipher Mode OFB and JPEG Compression

摘要

The traffic of digital images has increased rapidly in the wide networks. The protection of this kind of data becomesudimportant for many reasons such as confidentiality, obscurity and security. Nowadays, the most important engine toudprovide confidentiality is encryption. Therefore, the classical and modern ciphers are not suitable for such hugeudquantity of data in real-time environment. Selective encryption (SE) is an approach to encode a portion of the data inudorder to reduce computational requirements and to provide a proportional privacy. This paper presents a new methodudof partial or selective encryption for JPEG images. It is based on encoding of some Huffman bitstream with AES cipher.udThe proposed method results in a significant reduction in encrypting and decrypting processing time, provides audconstant bit rate and keeps the JPEG bitstream compliance.