Compact and high-speed hardware architectures and logic optimization methods for the AES algorithm Rijndael are described. Encryption and decryption data. look-up table logic or ROMs in the previous approaches, which requires a lot of hardware support. Reference [16] proposed the use of. Efficient Hardware Architecture of SEED S-box for . In order to optimize the inverse calculation, we . “A Compact Rijndael Hardware Architecture with. S- Box.

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Results and Performance Analysis The performance analysis of the proposed and simulated design is on the 0. Again a cycle processes a data sample of bits and it requires 4 cycles to provide output. Each legend cites the functions in the same top—down order as they are contained in the respective Fig. So the latency is 4.

The basic idea of this approach is that the original S-box is broken down into a set of smaller size multiplexer-switched truth-table of say n-variable functions using the Shannon expression. Optomization mapping of LUTs is provided by the following pseudo code:.

The next Section shows the proposed S-box architecture in detail. Elazm [ 28 ] shows a composite Galois Field design of S-box to reduce the size and the delay of the circuit. An initial attempt of optimizing AES S-box is introducing the composite field decomposition technique of S-box, in which a multi-stage positive polarity Reed-Muller architecture has been introduced [ 14 ]. He used an intermediate one-hot encoding of the input and arbitrary logic functions including cryptographic S-boxes to realize minimal power consumption.

However, it may be necessary to add a large number of additional flip-flops when the pipeline stage is placed between the decoder and encoder.

This design suffers long critical path delay due to switching and glitch. Therefore, the delay is normalized by a factor of twenty. Lightweight encryption design for embedded security.

All the byte bits of AES state is replaced by the S-box values. Pipelining speed, throughput, optimizstion efficiency can be computed as discussed in [ 31 ] using Eqs 12and 3.

By introducing a new composite field, the S-Box structure is also optimized. It can be observed that the more bytes processed in parallel, the more area and power are needed and the less arhcitecture is required. This is because they make use of the algebraic structure of the S-box to implement the substitution. IEEE international symposium on circuits and system, pp- — Table 4 Delay, Power and Area Comparisons.

A number of techniques have been presented in the literature, which have attempted to improve the performance of the S-box byte-substitution. Skip to search form Skip to main content.

## A Compact Rijndael Hardware Architecture with S-Box Optimization

Comparison Criterion Design—1 Design—2 Design—3 1-byte 4-byte byte 1-byte 4-byte byte 1-byte 4-byte byte Number of Iterations, m 16 4 1 16 4 1 16 4 1 Stage 1: Multiplexers delay ns 9.

The Free Dictionary https: The performance analysis of the proposed and simulated design is on the 0. The next Section will show these comparisons in graphs. That work reports the high performance in terms of throughput and latency.

JutlaVijay KumarJosyula R. To clarify the results obtained, the case com;act processing four bytes in parallel is considered here without pipelining. Citations Publications citing this paper. The resources that have been utilized are provided ootimization Table 1. S-bkx gate is employed to reduce power consumption of the mentioned circuit.

### A Novel Byte-Substitution Architecture for the AES Cryptosystem

The delay and area estimation for 1, 4 and 16 combinations are shown in Table 2. The former approach decomposes the elements of finite field into polynomials optimizafion the subfield and performs inversion there.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

The performance of all the three designs, with and without pipelined, are explained in this Sections and the results are listed in Table 4 in the next Section. Canright [ 27 ] improved the calculation of the S-box by switching the representation to a normal basis.

This paper presents an optimized look-up table implementation of S-box. A performance analysis and comparison of the proposed architecture is also conducted with those achieved by the existing techniques. Fig 11 shows the area-power consumption graph plotted against the witth critical path delay. The results of the comparison verify the outperformance of the proposed architecture in terms of power, delay and size.

Relatively large silicon area is the main drawback of this approach. The other two approaches consume three times as much power as the proposed design, while hw-lut [ 24 ] consumes about four times more power. AES the Rijndael algorithm is one such symmetric algorithm for encryption which replaced triple-DES and eventually became the number one choice for security algorithms all over the world by On the other hand, all three compavt techniques share the same idea of creating a 4-to—1 multiplexer by using only 2-to—1 multiplexers.

This paper approaches a single stage decoder function which performs better compared to Bertoni. This paper proposes the LUT of small size, which reduces the indexing and provides satisfactory results in terms of power, area and speed. The substitution byte S-box serves the purpose of bringing confusion to the data that is to be encrypted.