Although advances in SHA-1 cryptanalysis have been made since the 2005 announcement of a 2 attack by Wang et al., the details of the attack have not yet been presented or verified. This note does just that. Working from Adi Shamir’s 2005 CRYPTO rump session presentation of Wang et al.’s work, this note verifies and presents the differential path and associated conditions. Although the error ana...

The hash function Skein is one of 5 finalists of the NIST SHA-3 competition. It is based on the block cipher Threefish which only uses three primitive operations: modular addition, rotation and bitwise XOR (ARX). This paper proposes a free-start partial-collision attack on round-reduced Skein-256 by combing the rebound attack with the modular differential techniques. The main idea of our attack...

Serpent is one of the 5 AES finalists. The best attack published so far analyzes up to 9 rounds. In this paper we present attacks on 7-round, 8-round, and 10-round variants of Serpent. We attack a 7round variant with all key lengths, and 8and 10-round variants with 256-bit keys. The 10-round attack on the 256-bit keys variants is the best published attack on the cipher. The attack enhances the ...

DNA computing based image encryption is a new, promising field. In this paper, we propose a novel image encryption scheme based on DNA encoding and spatiotemporal chaos. In particular, after the plain image is primarily diffused with the bitwise Exclusive-OR operation, the DNA mapping rule is introduced to encode the diffused image. In order to enhance the encryption, the spatiotemporal chaotic...

Midori is a family of SPN-based lightweight block ciphers designed to optimize the hardware energy consumption per bit during the encryption and decryption operations. At ASIACRYPT 2015, two variants of the cipher, namely Midori128 and Midori64, which support a 128-bit secret key and a 64/128-bit block, respectively, were proposed. Recently, a meet-in-the-middle attack and an invariant subspace...

This paper proposes several approaches to improve the collision attack on MD4 proposed by Wang et al. First, we propose a new local collision that is the best for the MD4 collision attack. Selection of a good message difference is the most important step in achieving effective collision attacks. This is the first paper to introduce an improvement to the message difference approach of Wang et al...

MIBS is a 32-round lightweight block cipher with 64-bit block size and two different key sizes, namely 64-bit and 80-bit keys. Bay et al. provided the first impossible differential, differential and linear cryptanalyses of MIBS. Their best attack was a linear attack on the 18-round MIBS-80. In this paper, we significantly improve their attack by discovering more approximations and mounting Herm...

recently, baghery et al. [1, 2] presented some attacks on two rfid protocols, namely yoon and jung et al. protocols, and proposed the improved version of them. however, in this note, we show that the improved version of the jung et al. protocol suffers from desynchronization attack and the improved version of the yoon's protocol suffers from secret disclosure attack. the success probabilit...

The TWEAKEY/STK construction is an increasingly popular approach for designing tweakable block ciphers that notably uses a linear tweakey schedule. Several recent attacks have analyzed the implications of this approach for differential cryptanalysis and other attacks that can take advantage of related tweakeys. We generalize the clustering approach of a recent differential attack on the tweakab...