New Implementations of the WG Stream Cipher

Provided by: University of Waterloo
Topic: Hardware
Format: PDF
In this paper, the authors present two new hardware designs of theWG-128 cipher, one for the Multiple Output Welch-Gong version (MOWG), and the other for the single output version Welch-Gong (WG), based on type-II Optimal Normal Basis (ONB) representation. The proposed MOWG design uses signal reuse techniques to reduce hardware cost in the MOWG transformation, while it increases the speed by eliminating the inverters from the critical path. This is accomplished through reconstructing the Key and Initial Vector (IV) loading Algorithm (KIA) and the feedback polynomial of the Linear Feedback Shift Register (LFSR).

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