11 Result(s)
within
Computer Science
Coding and Information Theory
Cryptology
Yosuke Todo
Chapter
Conference Paper
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Chapter and Conference Paper
A Modular Approach to the Incompressibility of Block-Cipher-Based AEADs
Incompressibility is one of the most fundamental security goals in white-box cryptography. Given recent advances in the design of efficient and incompressible block ciphers such as SPACE, SPNbox and WhiteBlock, w...
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Chapter and Conference Paper
New Attacks from Old Distinguishers Improved Attacks on Serpent
Serpent was originally proposed in 1998 and is one of the most studied block ciphers. In this paper we improve knowledge of its security by providing the current best attack on this cipher, which is a 12-round...
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Chapter and Conference Paper
Lower Bounds on the Degree of Block Ciphers
Only the method to estimate the upper bound of the algebraic degree on block ciphers is known so far, but it is not useful for the designer to guarantee the security. In this paper we provide meaningful lower...
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Chapter and Conference Paper
Improved Division Property Based Cube Attacks Exploiting Algebraic Properties of Superpoly
The cube attack is an important technique for the cryptanalysis of symmetric key primitives, especially for stream ciphers. Aiming at recovering some secret key bits, the adversary reconstructs a superpoly wit...
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Chapter and Conference Paper
Cube Attacks on Non-Blackbox Polynomials Based on Division Property
The cube attack is a powerful cryptanalytic technique and is especially powerful against stream ciphers. Since we need to analyze the complicated structure of a stream cipher in the cube attack, the cube attac...
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Chapter and Conference Paper
Nonlinear Invariant Attack
In this paper we introduce a new type of attack, called nonlinear invariant attack. As application examples, we present new attacks that are able to distinguish the full versions of the (tweakable) block ciphers
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Chapter and Conference Paper
Compact Representation for Division Property
The division property, which is a new method to find integral characteristics, was proposed at Eurocrypt 2015. Thereafter, some applications and improvements have been proposed. The bit-based division property...
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Chapter and Conference Paper
Bit-Based Division Property and Application to Simon Family
Ciphers that do not use S-boxes have been discussed for the demand on lightweight cryptosystems, and their round functions consist of and, rotation, and xor. Especially, the Simon family is one of the most famous...
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Chapter and Conference Paper
Practical Cryptanalysis of a Public-Key Encryption Scheme Based on New Multivariate Quadratic Assumptions
In this paper, we investigate the security of a public-key encryption scheme introduced by Huang, Liu and Yang (HLY) at PKC’12. This new scheme can be provably reduced to the hardness of solving a set of quadr...
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Chapter and Conference Paper
FFT Key Recovery for Integral Attack
An integral attack is one of the most powerful attacks against block ciphers. We propose a new technique for the integral attack called the Fast Fourier Transform (FFT) key recovery. When the integral distingu...
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Chapter and Conference Paper
Upper Bounds for the Security of Several Feistel Networks
In this paper, we are dealing with upper bounds for the security of some Feistel networks. Such a topic has been discussed since the introduction of Luby-Rackoff construction, but it is unrealistic constructio...
