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Real-time Partial Encryption of Oigital Video using Symmetric Dynamic Dual Keys Algorithm (SDD) | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 30, Issue 5, 2012, Pages 710-728 PDF (341.2 K) | ||
| DOI: 10.30684/etj.30.5.2 | ||
| Authors | ||
| Basima Z.Yaco; AbdulMonem S. Rahma | ||
| Abstract | ||
| In recent years, as digital video technologies have been broadly used in TV,communication and multimedia. Security and privacy issues of the transmitted data have become an important concern in multimedia technology. Digital video stream is quite different from traditional textual data because interframe dependencies exist in digital video. Special digital video encryption algorithms are required because of their special characteristics, such as coding structure, large amount of data and real-time constraints. This paper presents a real-time partial encryption to digital video technique based on Symmetric Dynamic Dual (SDD) keys algorithm which is fast enough to meet the realtime requirements with high level of security. This approach uses dual key for encryption with variable (dynamic) block bits size,each block bits size (3 or 4 bits ) are interpreted as an element of a finite field.. The first key is called control key determines the length of bits block (3 or 4 bits block) size to encrypt, and the second key is used for encryption by using a equation: Y = X. A+ BWhereX is bits block, AandB are the encryption keys. The mathematical operations addition and multiplication in this equation are based on mathematical theory of Galois field GF(2 ). In this technique the I-frame (Intra-frame ) of the digital video scene is extracted and decomposed the color picture into its three color channels:luma channel (Y) and two chrominance channels Cb and Cr,with note that the frames of digital video is in YCbCr color system, the SDD algorithm is applied to the Y channel. The encryption algorithm achieves best timing results, and it provides high level of security by its great resistant against brute force attacks, because it uses dual key and dynamic block cipher, hence it will be very difficult to guess the key. To decrypt the ciphertext with 128 bits, the attacker needs 8.86569157e+188 of possibilities of keys as minimum and 7.91569097e+253 as maximum. | ||
| Keywords | ||
| Dynamic block encryption; Dual keys for encryption; Encryption digital video; partial encryption for Digital video; Digital video encryption in real time | ||
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