VLSI Implementation of Scalable Encryption Algorithm for Different Text and Processor Size

Abstract

The Efficiency of present symmetric encryption algorithms mainly depends on implementation cost and resulting performances. Present symmetric encryption, like the Advanced Encryption Standard (AES) rather focus on finding a good tradeoff between cost, security and performances. Some present symmetric encryption algorithms are targeted for software implementations and shows significant efficiency improvements on these platforms compared to other algorithms. From these algorithms, consider a general context where we have very limited processing resources (e.g. a small processor). It yields design criteria such as: low memory requirements, small code size, limited instruction set, i.e. Scalable Encryption Algorithm (SEA). For this purpose, loop architecture of the block cipher is presented. The total modules of SEA written in VHDL coding, the simulation and synthesis results are verified by the Virtex-4 of Xilinx 9.1i. This paper also carefully describes the implementation details and corresponding area requirements

Performance Analysis and Implementation of Scalable Encryption Algorithm on FPGA

“…It is essential that n is a multiple of 6b, means for an 8-bit processor size, we can have 48, 96, 144, 192…-bit block cipher [2]. …”

“…Figure 5. Architecture of Decryption Block [2] Decryption block has been implemented as a module and all other modules like Modulo addition, S-Box, Bit rotation, Inverse Word rotation are internal modules of it. The Feistel structure ensures that decryption and encryption are very similar processes but the only difference is that the Subkeys are applied in the reverse order when decrypting.…”

“…There are several standard algorithms employed for encryption such as Tiny Encryption Algorithm (TEA) or Yuval's proposal, Data Encryption Standard (DES), its cipher block chained counterpart (3DES), and the Advanced Encryption Standard (AES) employing the above key sizes. However, some of these are old and could not afford commendable security against attacks such as linear and differential cryptanalysis due to their small keysize while some need large processor size and are not parametric [2]. Hence to meet all the above requirements, a standardized authentication and encryption algorithm, the scalable encryption algorithm (SEA),with large key size and large number of rounds is able to deliver high speed software and hardware implementations of low-cost encryption routines (i.e.…”