The Grain Family of Stream Ciphers

  • Authors:
  • Martin Hell;Thomas Johansson;Alexander Maximov;Willi Meier

  • Affiliations:
  • Dept. of Electrical and Information Technology, Lund University, Lund, Sweden 221 00;Dept. of Electrical and Information Technology, Lund University, Lund, Sweden 221 00;Ericsson AB, Lund, Sweden;FHNW, Windisch, Switzerland CH-5210

  • Venue:
  • New Stream Cipher Designs
  • Year:
  • 2008

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Abstract

A new family of stream ciphers, Grain, is proposed. Two variants, a 80-bit and a 128-bit variant are specified, denoted Grain and Grain-128 respectively. The designs target hardware environments where gate count, power consumption and memory are very limited. Both variants are based on two shift registers and a nonlinear output function. The ciphers also have the additional feature that the speed can be easily increased at the expense of extra hardware.