Results 11 to 20 of about 30 (28)

Differential-Linear Cryptanalysis of Reduced Round ChaCha

IACR Transactions on Symmetric Cryptology
ChaCha is a well-known stream cipher that has been used in many network protocols and software. In this paper, we study the security of reduced round ChaCha. First, by considering the differential-linear hull effect, we improve the correlation of a four-
Zhichao Xu, Hong Xu, Lin Tan, Wenfeng Qi
doaj   +1 more source

Enhancing Differential-Neural Cryptanalysis [PDF]

, 2022
In CRYPTO 2019, Gohr shows that well-trained neural networks can perform cryptanalytic distinguishing tasks superior to traditional differential distinguishers.
Jian Guo, Li Ma, Meicheng Liu, Yi Tu, Zhenzhen Bao   +4 more
core  

Improved Linear Approximations to ARX Ciphers and Attacks Against ChaCha [PDF]

, 2021
In this paper, we present a new technique which can be used to find better linear approximations in ARX ciphers. Using this technique, we present the first explicitly derived linear approximations for 3 and 4 rounds of ChaCha and, as a consequence, it ...
Murilo Coutinho, T. C. Souza Neto
core  

Enhancing the Key Recovery Attack on Round Reduced Salsa

IEEE Access
Salsa is the most well-known stream cipher and a finalist of the eSTREAM project. The concept of probabilistic neutral bits (PNBs) first presented by Aumasson et al., is the most important step in the cryptanalysis of Salsa.
Chandan Dey, Sabyasachi Dey, Rahul Girme, Santanu Sarkar   +3 more
doaj   +1 more source

A Quantum Differential Attack on ChaCha and Related Resources Estimation

IEEE Access
Existing classical cryptanalytic techniques against ChaCha primarily rely on differential cryptanalysis, leveraging probabilistic neutral bits (PNBs) introduced by Aumasson et al. Separately, Bathe et al.
Mintu Mandal, Hirendra Kumar Garai, Sabyasachi Dey   +2 more
doaj   +1 more source

A MIQCP-Based Automatic Search Algorithm for Differential-Linear Trails of ARX Ciphers(Long Paper) [PDF]

, 2023
Differential-linear (DL) cryptanalysis has undergone remarkable advancements since it was first proposed by Langford and Hellman \cite{langford1994differential} in 1994. At CRYPTO 2022, Niu et al.
Chenhui Jin, Guangqiu Lv, Ting Cui
core  

New Multi-bit Differentials to Improve Attacks Against ChaCha [PDF]

, 2020
The stream cipher ChaCha is an ARX type algorithm developed by Daniel Bernstein in 2008. Since its development, ChaCha has received a lot of attention and is currently being used in several systems.
Murilo Coutinho, T. C. Souza Neto
core  

Differential Cryptanalysis of Salsa and ChaCha -- An Evaluation with a Hybrid Model [PDF]

, 2016
While \textsf{Salsa} and \textsf{ChaCha} are well known software oriented stream ciphers, since the work of Aumasson et al in FSE 2008 there aren\u27t many significant results against them.
Arka Rai Choudhuri, Subhamoy Maitra
core  

Salsa20 Cryptanalysis: New Moves and Revisiting Old Styles [PDF]

, 2015
In this paper, we revisit some existing techniques in Salsa20 cryptanalysis, and provide some new ideas as well. As a new result, we explain how a valid initial state can be obtained from a Salsa20 state after one round.
Goutam Paul, Subhamoy Maitra, Willi Meier   +2 more
core   +1 more source

On Improved Cryptanalytic Results against ChaCha for Reduced Rounds ≥ 7 [PDF]

In this paper, we analyze the subtle issues of complexity estimates related to state-of-the-art cryptanalytic efforts on ChaCha. In this regard, we demonstrate that the currently best-known cryptanalytic result on $7$-round ChaCha with time $2^{189.7 ...
Nitin Kumar Sharma, Sabyasachi Dey, Santanu Sarkar, Subhamoy Maitra   +3 more
core