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Springer, Lecture Notes in Computer Science, p. 166-171, 1997

DOI: 10.1007/bfb0052344

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XMX: A firmware-oriented block cipher based on modular multiplications

Journal article published in 1997 by David M'Raïhi, David M. Raihi, David Naccache, Jacques Stern, Serge Vaudenay
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

This paper presents xmx, a new symmetric block cipher optimized for public-key libraries and microcontrollers with arithmetic coprocessors. xmx has no S-boxes and uses only modular multiplications and xors. The complete scheme can be described by a couple of compact formulae that o#er several interesting time-space trade-o#s (number of rounds/key-size for constant security). In practice, xmx appears to be tiny and fast: 136 code bytes and a 121 kilo-bits/second throughput on a Siemens SLE44CR80s smart-card (5 MHz oscillator). 1