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Title:	Fast and secured MPEG-2 encryption algorithms using chaotic maps
Authors:	Ali Abdulgader Mohamed Alshanoukie (P44224)
Supervisor:	Mahamod Ismail, Prof. Dr.
Keywords:	Algorithms Smart devices MPEG video Chaotic maps Universiti Kebangsaan Malaysia -- Dissertations
Issue Date:	7-May-2017
Description:	With the advancement of communication and networks, the use of smart devices to capture and share multimedia information between device-to-device or via the Internet, will necessitate the device and communication security imperative. Although cryptographic algorithms provide data security, but those algorithms are not compatible for video and audio data that embedded in the smart devices. Moreover, since smart devices have limited processing speed, the complexity of cryptographic algorithms brings large overhead and causes delay in real-time multimedia application. The main aim of the research is to develop fast and secured MPEG video and audio encryption algorithms using chaotic maps. The developed algorithms exploit the potential application of chaotic systems in conventional encryption algorithms to protect both MPEG video and audio in the compression domain. To achieve better encryption efficiency for multimedia data, the enhancement of the encryption algorithms focuses on the processing time and security level. Two new algorithms are proposed for video namely Modified Advanced Encryption Standard (MAES) and Modified Rivest Cipher 4 (MRC4) algorithms, and a new algorithm for audio data namely Hybrid Advanced Audio coding Encryption (HAACE). In the MAES algorithm, the MixColumn (MC) of the conventional AES is replaced with the chaos system and the Dynamic S-box based on the round keys and MC transformation is used instead of the default S-box. The key expansion algorithm is modified to obtain a satisfactory level of security. In the MRC4 algorithm, the modification is performed on the RC4-Key-scheduling algorithm (KSA) and Pseudo random generation algorithm (PRGA) based on the use of the maximum pixel intensity of image and chaotic maps. The HAACE is developed based on the use of chaotic system; modular multiplication and circular shifts encrypt the audio data in the AAC encoding process. The performance of the proposed algorithms is evaluated and benchmarked against the conventional AES and RC4 algorithms in terms of time consumption, key space, and robustness. The results show that the proposed MAES reduces the encryption time consumption by about 35.16% and the key space increased to about 2178 compared to the conventional AES, hence a higher level of security is achieved and there is sufficient robustness to resist most attacks. Moreover, the MRC4 algorithm consumes 6% less time; the key space is increased to 2136 with 10-30 chaotic seeds compared to conventional RC4, thus increasing the security levels. Furthermore, the proposed HAACE algorithm provides good audible distortion with a slight drop of 4% in the compression ratio compared to the Quantized Spectral Coefficients Encryption (QSCE) algorithm. The Signal-to-Noise-Ratio of the proposed encryption algorithm is reduced to about -6.89dB compared to QSCE. The use of the chaotic system makes key space become larger, hence, increasing the security level of the proposed HAACE algorithm.,Certification of Master's/Doctoral Thesis" is not available
Pages:	199
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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