Using Data-Dependent (DD) Permutations (DDP) as main cryptographic primitive, a new 64-bit block cipher is presented, ten-round DDP-64. Since the sum of all outputs of the conventional DDP is a linear Boolean function, non-linear DDP-based operation F is used additionally in DDP-64. The DDP-64 is a pure DDP-based cipher, i. e. it uses only permutations and the XOR operation. The designed cipher uses very simple key scheduling that defines high performance, especially in the case of frequent key refreshing. A novel feature of DDP-64 is the use of the switchable operation preventing the weak keys. The offered high level security strength does not sacrifice the implementation performance of DDP-64. Design and hardware implementation architectures of this cipher are presented. The synthesis results for both Field Programmable Gate Arrays (FPGA) and Application Specific Integrated Circuits (ASIC) implementations prove that DDP-64 is very flexible and powerful new cipher, especially for high speed WLANs and WPANs. The achieved hardware performance up to 6.5 Gbps and the implementation area cost of DDP-64 are compared with other ciphers, used in security layers of wireless protocols (Bluetooth, WAP, OMA, UMTS and IEEE 802.11). From these comparisons, it is proven that DDP-64 is a flexible new cipher with better performance in most of the cases, suitable for wireless communications networks of present and future.

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[24] Zimmermann R., Curiger A., Bonnenberg H., Kaeslin H., Felber N., and Fichtner W., “A 177 Mb/s VLSI Implementation of the International Data Encryption Algorithm,” IEEE Journal of Solid State Circuits, vol. 29, no. 3, March 1994. Nikolay Moldovyan is an honoured inventor of Russian Federation in 2002, a chief researcher with the Specialized Center of Program Systems “SPECTR”, and a professor with the Saint Petersburg Electrical Engineering University. He received his Diploma and PhD from Academy of Sciences of Moldova, 1981. His research interests include computer security, cryptography, and currently developed concept of the variable transformations as a new direction in applied cryptography. He is a member of the IACR. Nicolas Sklavos is a PhD researcher with the Electrical and Computer Engineering Department of the University of Patras, Greece. His interests include computer security, new encryption algorithms design, wireless communications, and reconfigurable computing. He holds an award for his PhD research on “VLSI Designs of Wireless Communications Security Systems” from IFIP VLSI SOC 2003. He is a referee of International Journals and Conferences. He is a member of the IEEE, the Technical Chamber of Greece, and the Greek Electrical Engineering Society. He has authored or coauthored up to 50 scientific articles in the areas of his research. Odysseas Koufopavlou received the Diploma of electrical engineering in 1983 and the PhD degree in electrical engineering in 1990, both from University of Patras, Greece. From 1990 to 1994 he was at the IBM Thomas J. Watson Research Center, Yorktown Heights, NY, USA. He is currently an associate professor with the Department of Electrical and Computer Engineering, University of Patras. His research interests include VLSI, low power design, VLSI crypto systems, and high performance communication subsystems architecture and implementation. He has published more than 100 technical papers and received patents and inventions in these areas.