International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Cryptanalysis of the GPRS Encryption Algorithms GEA-1 and GEA-2

Christof Beierle , Ruhr-Universität Bochum Germany
Patrick Derbez , Univ Rennes, CNRS, IRISA, France
Gregor Leander , Ruhr-Universität Bochum Germany
Gaetan Leurent , Inria, Paris, France
Havard Raddum , Simula UiB, Bergen, Norway
Yann Rotella , Université Paris-Saclay, UVSQ, CNRS, Laboratoire de Mathématiques de Versailles, Versailles, France
David Rupprecht , Ruhr-Universität Bochum Germany
Lukas Stennes , Ruhr-Universität Bochum Germany
DOI: 10.1007/978-3-030-77886-6_6 (login may be required)
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Conference: EUROCRYPT 2021
Video from EUROCRYPT 2021
  title={Cryptanalysis of the GPRS Encryption Algorithms GEA-1 and GEA-2},
  note={This paper presents the first publicly available cryptanalytic attacks on the GEA-1 and GEA-2 algorithms. Instead of providing full 64-bit security, we show that the initial state of GEA-1 can be recovered from as little as 65 bits of known keystream (wit},
  author={Christof Beierle and Patrick Derbez and Gregor Leander and Gaetan Leurent and Havard Raddum and Yann Rotella and David Rupprecht and Lukas Stennes},