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by John Kelsey, Bruce Schneier, David Wagner
http://www.cs.berkeley.edu/~daw/papers/speed-sac98.ps
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Abstract:

Abstract. The cipher family SPEED (and an associated hashing mode) was recently proposed in Financial Cryptography '97. This paper cryptanalyzes that proposal, in two parts: First, we discuss several troubling potential weaknesses in the cipher. Next, we show how to efficiently break the SPEED hashing mode using differential related-key techniques, and propose a differential attack on 48-round SPEED. These results raise some significant questions about the security of the SPEED design. 1

Citations

200 The RC5 encryption algorithm – Rivest - 1995
108 New types of cryptanalytic attacks using related keys – Biham - 1993
92 Markov ciphers and differential cryptanalysis – Lai, Massey, et al.
36 Key-schedule cryptanalysis of – Kelsey, Schneier, et al. - 1996
33 Improved Cryptanalysis of RC5 – Biryukov, Kushilevitz - 1998
33 Unbalanced Feistel Networks and Block Cipher Design – Schneier, Kelsey - 1996
20 Fast Software Encryption: Designing Encryption Algorithms for Optimal Speed on – Schneier, Whiting - 1997
15 Recent developments in the design of conventional cryptographic algorithms – Preneel, Rijmen, et al. - 1998
14 On the design and security of RC2 – Knudsen, Rijmen, et al. - 1998
14 On weaknesses of non-surjective round functions – Rijmen, Preneel, et al. - 1997
11 The SPEED Cipher – Zheng - 1997
10 Chosen-key Attacks on a Block Cipher – Winternitz, Hellman - 1987