Results 1 to 10 of about 30 (28)

Cryptanalysis of Reduced Round ChaCha – New Attack & Deeper Analysis

IACR Transactions on Symmetric Cryptology, 2023
In this paper we present several analyses on ChaCha, a software stream cipher. First, we consider a divide-and-conquer approach on the secret key bits by partitioning them.
Sabyasachi Dey, Hirendra Kumar Garai, Subhamoy Maitra   +2 more
doaj   +1 more source

Improved Differential-Linear Attacks with Applications to ARX Ciphers [PDF]

, 2022
International audienceWe present several improvements to the framework of differential-linear attacks with a special focus on ARX ciphers. As a demonstration of their impact, we apply them to Chaskey and ChaCha and we are able to significantly improve ...
Beierle, Christof, Broll, Marek, Canale, Federico, David, Nicolas, Flórez-Gutiérrez, Antonio, Leander, Gregor, Naya-Plasencia, María, Todo, Yosuke   +7 more
core   +3 more sources

Revamped Differential-Linear Cryptanalysis on Reduced Round ChaCha [PDF]

, 2022
In this paper, we provide several improvements over the existing differential-linear attacks on ChaCha. ChaCha is a stream cipher which has $20$ rounds. At CRYPTO $2020$, Beierle et al. observed a differential in the $3.5$-th round if the right pairs are
Hirendra Kumar Garai, Nitin Kumar Sharma, Sabyasachi Dey, Santanu Sarkar   +3 more
core  

Chosen IV Cryptanalysis on Reduced Round ChaCha and Salsa [PDF]

, 2015
Recently, ChaCha20 (the stream cipher ChaCha with 20 rounds) is in the process of being a standard and thus it attracts serious interest in cryptanalysis.
Subhamoy Maitra
core   +1 more source

Improved Differential-Linear Attacks with Applications to ARX Ciphers [PDF]

, 2020
We present several improvements to the framework of differential-linear attacks with a special focus on ARX ciphers. As a demonstration of their impact, we apply them to Chaskey and ChaCha and we are able to significantly improve upon the best attacks ...
A Bar-On, A Shimizu, AR Choudhuri, B Collard, D Dinu, D Khovratovich, DJ Bernstein, E Biham, E Biham, G Leurent, H Lipmaa, J-P Aumasson, J-P Aumasson, K Nyberg, L Knudsen, M Hermelin, M Matsui, N Mouha, S Dey, S Maitra, SK Langford, Y Todo, Z Shi   +22 more
core   +1 more source

Revisiting cryptanalysis on ChaCha from Crypto 2020 and Eurocrypt 2021 [PDF]

, 2021
ChaCha has been one of the prominent ARX designs of the last few years because of its use in several systems. The cryptanalysis of ChaCha involves a differential attack which exploits the idea of Probabilistic Neutral Bits (PNBs).
Chandan Dey, Sabyasachi Dey, Santanu Sarkar, Willi Meier   +3 more
core  

Significantly Improved Cryptanalysis of Salsa20 with Two-Round Criteria [PDF]

Over the past decade and a half, cryptanalytic techniques for Salsa20 have been increasingly refined, largely following the overarching concept of Probabilistically Neutral Bits (PNBs) by Aumasson et al. (FSE 2008).
Nitin Kumar Sharma, Sabyasachi Dey, Santanu Sarkar, Subhamoy Maitra   +3 more
core   +6 more sources

Moving a Step of ChaCha in Syncopated Rhythm [PDF]

, 2023
The stream cipher ChaCha is one of the most widely used ciphers in the real world, such as in TLS, SSH and so on. In this paper, we study the security of ChaCha via differential cryptanalysis based on probabilistic neutrality bits (PNBs).
Dongdai Lin, Meicheng Liu, Shichang Wang, Shiqi Hou   +3 more
core  

Neutrality-Based Symmetric Cryptanalysis [PDF]

, 2010
Cryptographic primitives are the basic components of any cryptographic tool. Block ciphers, stream ciphers and hash functions are the fundamental primitives of symmetric cryptography.
Khazaei, Shahram
core   +1 more source

Improved Neural Aided Statistical Attack for Cryptanalysis [PDF]

, 2021
At CRYPTO 2019, Gohr improved attacks on Speck32/64 using deep learning. In 2020, Chen et al. proposed a neural aided statistical attack that is more generic.
Hongbo Yu, Yi Chen
core