Abstract In this paper, a proposed cryptosystem algorithm ba sed on two different chaotic systems is presented. The proposed cryptosystem algorithm is designated as PCACH. A re cently developed encryption algorithm which is designated here, as HuXia is reviewed. These two algorithms are applied to three images of different color frequencies, i.e., different types of colored"images are encrypted with each of the two e ncryption algorithms. Both of them are applied to the different images with two different types of encryption modes, Elect ronic Code Book (ECB) and Cipher Block Chaining (CB C). Visual inspection is not sufficient to assess the quality of encryption so other measuring factors are consid ered based on measuring the maximum deviation and the Correlation Coefficie nt (CC) between the original and the encrypted images. For judging the force of security, we measure the plain"text sensit ivity by using Number of Pixels Change Rate (NPCR) and Unified Average Changing Intensity (UACI) analysis, measuring infor mation entropy and measuring the key sensitivity. A lso, the encryption/decryption time and the throughput are m easured for the two algorithms. The results suggest that PCACH is a very good algorithm and superior to HuXia.

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[21] Ziedan I., Fouad M., and Salem D., Application of Data Encryption Standard to Bitmap and JPEG Images, in Proceedings 20 th National Radio Science Conference , Egypt, pp. 1 8, 2003. Osama Abu Zaid received BSc from the Faculty Of Science, Menoufia University, Egypt in 2000. He is working as a network manager in Sadat City University. He received the MSc degree in data security from Faculty of sciences, Menoufia University, Egypt, in 2005. Now, he is lecturer in Faculty of computer sciences and information, Al Jouf University, KSA. He is working for his PhD. He is interested in multimedia securit y over computer networks, and he registered the PhD i n Faculty of sciences, Zagazig University, Egypt. Nawal El-Fishawy received the PhD degree in mobile communications the faculty of Electronic Eng., Menoufia University, Egypt, in collaboration with Southampton University in 1991. Now, she is the head of Computer Science and Engineering Dept., Faculty of Electronic Eng. Her research interest includes computer communication networks. Now, she directed her research interests to the developments of secur ity over wireless communications networks, and encryption algorithms. She has served as a reviewer for many national and international journals and conferences. Also she participated in many technica l program committees of major international conferences in wireless communications. Encryption Quality Measurement of a Proposed Cryptosystem Algorithm for the Colored Images Compared 29 Elsayed Nigm is a professor of mathematics, Department of Mathematics, Zagazig University, Egypt. He obtained his BSc in mathematics, statistics and computer sciences, Zagazig University, Faculty of Science, Egypt. He obtained his MSc degree in mathematics (functional analysis), Zagazig University, Faculty of Science, Egypt. He obtained his PhD degree mathematical statistics also, from Zagazig University, Faculty o f Science, Egypt in 1990. He honors awards prize of t he National Committee of Mathematics, by Egyptian Academy of Sciences and Technologies, Egypt in 2000. He has published more than 51 papers in international journals, international conferences, local Journals and Local Conferences.