Abstract This paper developed Arabic text encryption and compression based on dictionary indexing algorithm. The proposed algorithm includes encoding the Arabic text utilizing Arabic words dictionary, mapping encoded binary stream to a two- dimensional binary matrix, utilizing randomized variable size encryption key, applying randomly binary shuffling functions on the two-dimensional matrix, and mapping back the two-dimensional binary matrix into a sequential binary stream. The decryption algorithm at the receiver side implements the encryption steps reversely, utilizing the encryption key and the shared Arabic word dictionary. In this dictionary, the words of the formal Arabic language are classified into four categories according to the word length and sorted alphabetically. Each dictionary category is given an index size that is large enough to fit all words in that category. The proposed algorithm shuffles adjacent bits away from each other in random fashion through utilizing randomized variable length encryption key, two-dimensional shuffling functions, and repetition loop. Moreover, the index size is selected not to be multiple bytes to destroy any statistical feature that may be utilized to break the algorithm. The proposed algorithm analysis concluded that it could be broken after 3.215∗109 years. Moreover, the proposed algorithm achieved a less than 30% compression ratio.

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[32] Waters B., “Functional Encryption: Origins and Recent Developments,” in Proceeding of the International Workshop on Public Key Cryptography, Japan, pp. 51-54, 2013. Ahmad Al-Jarrah is an assistant professor at the Computer Science Department, Al-Balqa Applied University, Jordan. Dr. Al-Jarrah holds Ph.D in Computer Science from Computer Science Department, New Mexico State University, USA (2016). In addition, he received his B.Sc in Computer Science at Irbid National University, Jordan, and Master degree from the Computer Science department at Yarmouk University, Jordan. His research interest spans the general areas of online learning, social media, collaborative learning, and software engineering. Mohammad Al-Jarrah is a professor of Computer Engineering at Yarmouk University. He earned his Ph.D. in 2000 from University of Ohio, USA., MS and BS in Computer Engineering from Jordan University of Science and Technology, Jordan in 1992, and 1990. Since 2000, he has been working with the Department of Computer Engineering at Yarmouk University.His research interests include image indexing and retrieval, multimedia systems, distributed systems, medical imaging, Network management and security, Data Encryption, and many others. Amer Albsharat is a cyber security and cryptography expert. As a CEO of Smart Business Systems, he specializes in enterprise cyber security consulting and risk management services. With a solid experience in business continuity, disaster recovery, and information security management systems, Amer has a major focus on research and development in cryptography, artificial intelligence, and embedded systems.