08-06-2013, 02:47 PM
IMAGE ENCRYPTION USING BINARY KEY IMAGES
IMAGE ENCRYPTION.docx (Size: 90.33 KB / Downloads: 20)
ABSTRACT
This paper introduces a new concept for image encryption using a binary “key-image”. The key-image is either a bit plane or an edge map generated from another image, which has the same size as the original image to be encrypted. In addition, we introduce two new lossless image encryption algorithms using this key-image technique. The performance of these algorithms is discussed against common attacks such as the brute force attack, cipher text attacks and plaintext attacks. The analysis and experimental results show that the proposed algorithms can fully encrypt all types of images. This makes them suitable for securing multimedia applications and shows they have the potential to be used to secure communications in a variety of wired/wireless scenarios and real-time application such as mobile phone services.
INTRODUCTION
Network technologies and media services provide ubiquitous conveniences for individuals and organizations to collect, share, or distribute images/videos in multimedia networks and wireless or mobile public channels. Image security is a major challenge in storage and transmission applications. For example, video surveillance systems for homeland security purposes are used to monitor many strategic places such as public transportation, commercial and financial centers. Large amounts of videos and images with private information are generated, transmitted, or restored every day.
In addition, medical images with a patient’s records may be shared among the doctors in different branches of a health service organization over networks for different clinical purposes. These images and videos may contain private information. Providing security for these images and videos becomes an important issue for individuals, business and governments as well. Moreover, applications in the automobile, medical, construction and fashion industry require designs, scanned data, and blue-prints to be protected against espionage. Considering the long lifetime of image in the afore-mentioned domains, it is imperative to develop and employ techniques which protect the content throughout their lifetime.
Image encryption is an effective approach to protect images or videos by transforming them into completely different formats Several interesting approaches for image encryption have been developed. One method based on the cryptography concept considers images as data blocks or streams. It encrypts images block by block or stream by stream using different techniques. Data Encryption Standard (DES) and Advanced Encryption Standard (AES) are two examples of this approach. However, such encryption methods incur large computational costs and show poor error resilience.