Publications related to Cipher

Automatic Application of Power Analysis Countermeasures

Paolo Ienne, Francesco Regazzoni, Philip Brisk, David Novo Bruna, Ali Galip Bayrak

We introduce a compiler that automatically inserts software countermeasures to protect cryptographic algorithms against power-based side-channel attacks. The compiler first estimates which instruction instances leak the most information through side-channe ...

Institute of Electrical and Electronics Engineers2015

On Selection of Samples in Algebraic Attacks and a New Technique to Find Hidden Low Degree Equations

Serge Vaudenay, Pouyan Sepehrdad, Petr Susil

The best way of selecting samples in algebraic attacks against block ciphers is not well explored and understood. We introduce a simple strategy for selecting the plaintexts and demonstrate its strength by breaking reduced-round KATAN32 and LBlock. In both ...

Springer-Verlag Berlin2014

Recursive Diffusion Layers for Block Ciphers and Hash Functions

Pouyan Sepehrdad

Many modern block ciphers use maximum distance separable (MDS) matrices as the main part of their diffusion layers. In this paper, we propose a new class of diffusion layers constructed from several rounds of Feistel-like structures whose round functions a ...

Springer2012

Resistance Against Iterated Attacks by Decorrelation Revisited

Serge Vaudenay, Atefeh Mashatan, Asli Bay

Iterated attacks are comprised of iterating adversaries who can make

d

plaintext queries, in each iteration to compute a bit, and are trying to distinguish between a random cipher

C

and the ideal random cipher

C^*

based on all bits. In EUROCRYPT '99, ...

Springer2012

Statistical and Algebraic Cryptanalysis of Lightweight and Ultra-Lightweight Symmetric Primitives

Pouyan Sepehrdad

Symmetric cryptographic primitives such as block and stream ciphers are the building blocks in many cryptographic protocols. Having such blocks which provide provable security against various types of attacks is often hard. On the other hand, if possible, ...

EPFL2012

Synthetic Linear Analysis with Applications to CubeHash and Rabbit

Serge Vaudenay, Willi Meier, Yi Lu

In linear cryptanalysis, it has been considered most important and difficult to analyze the bias and find a large bias. The demonstration of a large bias will usually imply that the target crypto-system is not strong. Regarding the bias analysis, researche ...

2012

On Hiding a Plaintext Length by Preencryption

Serge Vaudenay, Cihangir Tezcan

It is a well known fact that encryption schemes can not hide a plaintext length when it is unbounded. We thus admit that an approximation of it may leak and we focus on hiding its precise value. Some standards such as TLS or SSH offer to do it by applying ...

Springer2011

Synthetic Linear Analysis: Improved Attacks on CubeHash and Rabbit

Serge Vaudenay, Willi Meier, Yi Lu

It has been considered most important and difficult to analyze the bias and find a large bias regarding the security of crypto-systems, since the invention of linear cryptanalysis. The demonstration of a large bias will usually imply that the target crypto ...

Springer2011

Neutrality-Based Symmetric Cryptanalysis

Shahram Khazaei

Cryptographic primitives are the basic components of any cryptographic tool. Block ciphers, stream ciphers and hash functions are the fundamental primitives of symmetric cryptography. In symmetric cryptography, the communicating parties perform essentially ...

EPFL2010

Distinguishing Distributions Using Chernoff Information

Serge Vaudenay, Pouyan Sepehrdad, Thomas Baignères

In this paper, we study the soundness amplification by repetition of cryptographic protocols. As a tool, we use the Chernoff Information. We specify the number of attempts or samples required to distinguish two distributions efficiently in various protocol ...

Springer2010

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Automatic Application of Power Analysis Countermeasures

On Selection of Samples in Algebraic Attacks and a New Technique to Find Hidden Low Degree Equations

Recursive Diffusion Layers for Block Ciphers and Hash Functions

Resistance Against Iterated Attacks by Decorrelation Revisited

Statistical and Algebraic Cryptanalysis of Lightweight and Ultra-Lightweight Symmetric Primitives

Synthetic Linear Analysis with Applications to CubeHash and Rabbit

On Hiding a Plaintext Length by Preencryption

Synthetic Linear Analysis: Improved Attacks on CubeHash and Rabbit

Neutrality-Based Symmetric Cryptanalysis

Distinguishing Distributions Using Chernoff Information

Statistical and Algebraic Cryptanalysis of Lightweight and Ultra-Lightweight Symmetric Primitives

Recursive Diffusion Layers for Block Ciphers and Hash Functions

On Hiding a Plaintext Length by Preencryption

Neutrality-Based Symmetric Cryptanalysis

On Selection of Samples in Algebraic Attacks and a New Technique to Find Hidden Low Degree Equations

Automatic Application of Power Analysis Countermeasures

Synthetic Linear Analysis with Applications to CubeHash and Rabbit

Synthetic Linear Analysis: Improved Attacks on CubeHash and Rabbit

Distinguishing Distributions Using Chernoff Information

Resistance Against Iterated Attacks by Decorrelation Revisited