Lauren May

Strengthening the Key Schedule of the AES

In this paper we present practical guidelines for designing secure block cipher key schedules. In particular we analyse the AES key schedule and discuss its security properties both from a theoretical viewpoint, and in relation to published attacks exploiting weaknesses in its key schedule. We then propose and analyse an efficient and more secure key schedule.

An Implementation of Bitsliced DES on the Pentium MMXTM Processor

In this paper we describe an implementation of the DES (and Triple-DES) algorithm using the bitslicing technique on an Intel Pentium MMX processor. Implementation specifics are discussed and comparisons made with an optimised C-coded DES implementation and an assembly language DES implementation. This paper sets the scene for future research of the inter-relation between design and implementation of the newer 128-bit symmetric block ciphers.