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Journals and Conferences
In this paper we present a new 128-bit block cipher called Square. The original design of Square concentrates on the resistance against diierential and linear cryptanalysis. However, after the initial design a dedicated attack was mounted that forced us to augment the number of rounds. The goal of this paper is the publication of the resulting cipher for… (More)
In this paper we present the block cipher Rijndael, which is one of the fifteen candidate algorithms for the Advanced Encryption Standard (AES). We show that the cipher can be implemented very efficiently on Smart Cards.
We present a new way to construct a MAC function based on a block cipher. We apply this construction to AES resulting in a MAC function that is a factor 2.5 more efficient than CBC-MAC with AES, while providing a comparable claimed security level.
This paper proposes a novel construction, called duplex, closely related to the sponge construction, that accepts message blocks to be hashed and—at no extra cost—provides digests on the input blocks received so far. It can be proven equivalent to a cascade of sponge functions and hence inherits its security against single-stage generic aaacks. The main… (More)
Large classes of weak keys have been found for the block cipher algorithm IDEA, previously known as IPES ?]. IDEA has a 128-bit key and encrypts blocks of 64 bits. For a class of 2 23 keys IDEA exhibits a linear factor. For a certain class of 2 35 keys the cipher has a global characteristic with probability 1. For another class of 2 51 keys only two… (More)
We present the new block cipher SHARK. This cipher combines highly non-linear substitution boxes and maximum distance separable error correcting codes (MDS-codes) to guarantee a good diiusion. The cipher is resistant against diierential and linear cryptanalysis after a small number of rounds. The structure of SHARK is such that a fast software… (More)
We present new a MAC function based on Rijndael that is a factor 2.5 more efficient than CBC-MAC with Rijndael, while providing a comparable claimed security level. This MAC function has the Alred construction  and can be seen as an optimized version of Alpha-MAC introduced in the same paper.