Linear cryptanalysis of DES, proposed by Matsui in 1993, has had a seminal impact on symmetric-key cryptography, having seen massive research efforts over the past two decades. It has spawned many variants, including multidimensional and zero-correlation linear cryptanalysis.30-Nov-2017

What is linear and differential cryptanalysis?

The two main classes of statistical cryptanalysis are the linear and differential attacks. … The idea of differential-linear cryptanalysis is to apply first a truncated differential attack and then a linear attack on different parts of the cipher and then combine them to a single distinguisher over the cipher.

What is linearity in cryptography?

A linear cipher is a cipher that all of its inner operations (diffusion and confusion operations) have the mathematical linear property. Linear property in mathematics is defined in such a way: f(a+b) = f(a) + f(b).

What is crypt analysis explain the cryptanalysis of DES?

Cryptanalysis is the study of methods for obtaining the meaning of encrypted information, without access to the secret information that is typically required to do so. Typically, this involves knowing how the system works and finding a secret key. Cryptanalysis is also referred to as codebreaking or cracking the code.

What are three basic variations of cryptanalysis?

There are three generic types of cryptanalysis, characterized by what the cryptanalyst knows: (1) ciphertext only, (2) known ciphertext/plaintext pairs, and (3) chosen plaintext or chosen ciphertext.

Why is cryptanalysis linear?

In cryptography, linear cryptanalysis is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. Attacks have been developed for block ciphers and stream ciphers. … Evidence of security against linear cryptanalysis is usually expected of new cipher designs.

What is strength of DES?

The Data Encryption Standard (DES) is a symmetric key block cipher which takes 64-bit plaintext and 56-bit key as an input and produces 64-bit cipher text as output. … Strength- The strength of DES lies on two facts: a. The use of 56-bit keys: 56-bit key is used in encryption, there are 256 possible keys.

What is non linearity in cryptography?

Abstract. The algebraic nonlinearity of an n-bit boolean function is defined as the degree of the polynomial f(X) ∈ Z2[x1,x2,…,xn] that represents f. We prove that the average degree of an ANF polynomial for an n-bit function is n + o(1).