What is known as linear cryptanalysis?

Linear cryptanalysis is a known plaintext attack in which the attacker studies probabilistic linear relations (called linear approximations) between parity bits of the plaintext, the ciphertext, and the secret key.

What is differential cryptanalysis in cryptography?

Differential cryptanalysis is a branch of study in cryptography that compares the way differences in input relate to the differences in encrypted output. It is used primarily in the study of block ciphers to determine if changes in plaintext result in any non-random results in the encrypted ciphertext.

How does a differential cryptanalysis work?

Differential cryptanalysis seeks to find the difference between related plaintexts that are encrypted. It is usually launched as an adaptive chosen plaintext attack; the attacker chooses the plaintext to be encrypted (but does not know the key) and then encrypts related plaintexts. …

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.

Who invented linear cryptanalysis?

Mitsuru Matsui
Linear cryptanalysis is one of the two most widely used attacks on block ciphers; the other being differential cryptanalysis. The discovery is attributed to Mitsuru Matsui, who first applied the technique to the FEAL cipher (Matsui and Yamagishi, 1992).

What is the difference between AES and DES?

AES is more secure than the DES cipher and is the de facto world standard. DES can be broken easily as it has known vulnerabilities. 3DES(Triple DES) is a variation of DES which is secure than the usual DES. AES can encrypt 128 bits of plaintext.

What are differential characteristics?

A differential characteristic defines not only the input and output differences, but also the internal differences after every round of the iterated cipher. The probability of a differential is equal to the sum of the probabilities of all differ- ential characteristics that correspond to this differential.

What are the methods of cryptanalysis?

Cryptanalysis techniques for stream ciphers are:

• Exhaustive Key Search Attack.
• Side Channel Analysis Attack.
• Time Memory Trade off Attacks.
• Distinguishing Attacks.
• Algebraic Attack.
• Correlation attacks.
• Guess and Determine attacks.
• Linear Masking attacks.

What is the purpose of linear cryptanalysis?

Linear Cryptanalysis It is now used widely on block ciphers across the field of cryptanalysis and is an effective starting point for developing more complex attacks. Linear cryptanalysis posits a linear relationship between the elements (characters or individual bits) of plaintext, the ciphertext, and the key.

Which block is cipher?

A block cipher is an encryption method that applies a deterministic algorithm along with a symmetric key to encrypt a block of text, rather than encrypting one bit at a time as in stream ciphers. For example, a common block cipher, AES, encrypts 128 bit blocks with a key of predetermined length: 128, 192, or 256 bits.

What are 5 major differences between AES and DES?

Difference between AES and DES Ciphers