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- Ewan Fleischmann, Christian Forler, Stefan Lucks
- AFRICACRYPT
- 2012

There are four somewhat classical double length block cipher based compression functions known: MDC-2, MDC-4, Abreast-DM, and Tandem-DM. They all have been developed over 20 years ago. In recent years, cryptographic research has put a focus on block cipher based hashing and found collision security results for three of them (MDC-2, Abreast-DM, Tandem-DM).… (More)

- Ewan Fleischmann, Christian Forler, Stefan Lucks
- FSE
- 2012

On-Line Authenticated Encryption (OAE) combines privacy with data integrity and is on-line computable. Most block cipher-based schemes for Authenticated Encryption can be run on-line and are provably secure against nonce-respecting adversaries. But they fail badly for more general adversaries. This is not a theoretical observation only – in practice, the… (More)

- Ewan Fleischmann, Michael Gorski, Stefan Lucks
- IACR Cryptology ePrint Archive
- 2009

We provide the first proof of security for Tandem-DM, one of the oldest and most well-known constructions for turning a block cipher with n-bit block length and 2n-bit key length into a 2n-bit cryptographic hash function. We prove, that when Tandem-DM is instantiated with AES-256, block length 128 bits and key length 256 bits, any adversary that asks less… (More)

- Ewan Fleischmann, Michael Gorski, Stefan Lucks
- IACR Cryptology ePrint Archive
- 2009

We provide the first proof of security for Abreast-DM, one of the oldest and most well-known constructions for turning a block cipher with n-bit block length and 2n-bit key length into a 2n-bit cryptographic hash function. In particular, we prove that when Abreast-DM is instantiated with AES-256, i.e. a block cipher with 128-bit block length and 256-bit key… (More)

- Ewan Fleischmann, Michael Gorski, Jan-Hendrik Hühne, Stefan Lucks
- 2009

The GOST block cipher was developed in the 1970s and is a standard currently used in the Russian government. In this paper we present a new attack on the GOST block cipher that uses only 2 7.5 chosen plaintexts and ciphertexts and runs in time 2 7.5. Due to the very low complexity we state that our attack is memoryless and runs in nearly zero time. In this… (More)

- Ewan Fleischmann, Christian Forler, Stefan Lucks, Jakob Wenzel
- IACR Cryptology ePrint Archive
- 2012

- Ewan Fleischmann, Christian Forler, Michael Gorski
- IACR Cryptology ePrint Archive
- 2008

In this note we give an overview on the current state of the SHA-3 candidates. First, we classify all publicly known candidates and, second, we outline and summarize the performance data as given in the candidates documentation for 64-bit and 32-bit implementations. We define performance classes and classify the hash algorithms. Note, that this article will… (More)

- Ewan Fleischmann, Christian Forler, Stefan Lucks, Jakob Wenzel
- IACR Cryptology ePrint Archive
- 2011

- Ewan Fleischmann, Michael Gorski, Stefan Lucks
- IACR Cryptology ePrint Archive
- 2009

ARIA [4] is a block cipher proposed at ICISC'03. Its design is very similar to the advanced encryption standard (AES). The authors propose that on 32-bit processors, the encryption speed is at least 70% of that of the AES. They claim to offer a higher security level than AES. In this paper we present two attacks of reduced round ARIA which shows some… (More)

- Ewan Fleischmann, Michael Gorski, Stefan Lucks
- IACR Cryptology ePrint Archive
- 2010

At Crypto 2005, Coron et al. introduced a formalism to study the presence or absence of structural flaws in iterated hash functions: If one cannot differentiate a hash function using ideal primitives from a random oracle, it is considered structurally sound, while the ability to differentiate it from a random oracle indicates a structural weakness. This… (More)