Cryptanalysis Attacks

Question 1

amount of time and processing power required to break an encryption mechanism.

Answer 1

Work Force

Question 2

Time = number of primitive operations that must be performed, Memory = amount of storage required to perform attack, Data = amount of data of both plaintext and ciphertext.

Answer 2

Cryptanalysis Resources for Cracking Systems

Question 3

attacker obtains ciphertexts that correspond to set of plaintext of attackers choosing. Goal is to get the key and use key over and over again for other messages.

Answer 3

Chosen Plaintext Attacks

Question 4

attacker has access to collection of ciphertext only. requires access to corresponding plaintext or key to be successful.

Answer 4

Ciphertext-Only Attack

Question 5

attacker obtains ciphertext w/2 different keys.

Answer 5

Related-Key Attack

Question 6

attacker can generate the decrypted text.

Answer 6

Chosen Ciphertext

Question 7

encrypted text and plaintext are known, goal is to get the key.

Answer 7

Known plaintext

Question 8

useful against block ciphers, extension of differential cryptanalysis, based on substitution-permutation networks.

Answer 8

Integral Cryptanalysis

Question 9

applicable to symmetric keys, examines differences in input and how it affects the result difference of output, works with known plaintext and ciphertext only.

Answer 9

Differential Cryptanalysis

Question 10

??? functionally equivalent algorithm for encryption/decryption but no key.

??? attacker learns additional info about cipher text not previously known.

??? attacker gains “Shannon info” (raw data) about plaintext or cipher text not previously known.

*** Total Break : I have the key

Answer 10

Global Deduction / Instance Deduction / Information Deduction Etc …