An asynchronous pipeline architecture for the low-power AES S-box

To obtain a low-power and compact implementation of the advanced encryption standard(AES)S-box,an asynchronous pipeline architecture over composite field arithmetic was proposed in this paper.Inthe presented S-box,some improvements were made as follows.(1)Level-sensitive latches were insertedin data path to block the propagation Of the dynamic hazards,which lowered the power of data path cir-cuit.(2)Operations of latches were controlled by latch controllers based on presented asynchronous se-quence element:LC-element,which utilized static asymmetric C-element to construct a simple and pow-er-efficient circuit structure.(3)Implementation of the data path circuit was a semi-custom standard-cellcircuit on 0.25μm complementary mental oxide semiconductor(CMOS)process;and the full-custom de-sign methodology was adopted in the handshake circuit design.Experimental results show that the result-ing circuit achieves nearly 46% improvement with moderate area penalty(11.7%)compared with the re-lated composite field S-box in power performance.The presented S-box circuit can be a hardware intelli-gent property(IP)embedded in the targeted systems such as wireless sensor networks(WSN),smart-cams and radio frequency identification(RFID).

To obtain a low-power and compact implementation of the advanced encryption standard （AES） S- box, an asynchronous pipeline architecture over composite field arithmetic was proposed in this paper. In the presented S-box, some improvements were made as follows. （1） Level-sensitive latches were inserted in data path to block the propagation Of the dynamic hazards, which lowered the power of data path circuit. （2） Operations of latches were controlled by latch controllers based on presented asynchronous sequence element： LC-element, which utilized static asymmetric C-element to construct a simple and power-efficient circuit structure. （3） Implementation of the data path circuit was a semi-custom standard-cell circuit on 0.25μm complementary mental oxide semiconductor （CMOS） process; and the full-custom design methodology was adopted in the handshake circuit design. Experimental results show that the resulting circuit achieves nearly 46% improvement with moderate area penalty （ 11.7% ） compared with the related composite field S-box in power performance. The presented S-box circuit can be a hardware intelli-gent property （IP） embedded in the targeted systems such as wireless sensor networks （WSN）, smart-cards and radio frequency identification （RFID）.