Test 2

Question 1

Known-plaintext attack

Answer 1

An attacker has access to previous plaintext-ciphertext pair in addition to the intercepted ciphertext

Question 2

Chosen plaintext attack

Answer 2

Attacker had access to the ciphertext, the encryption machine, and plaintext-ciphertext pairs that they have generated with the encryption machine

Question 3

Chosen ciphertext attack

Answer 3

The attacker has access to the ciphertext, the decryption algorithm, and plaintext-ciphertext pairs that they have generated using the decryption algorithm

Question 4

2DES is vulnerable to….

Answer 4

Meet in the middle attacks

Question 5

RSA is vulnerable to…

Answer 5

Chosen ciphertext attacks

Question 6

What is a cryptographic work function

Answer 6

A value to compute the strength of encryption, often measured in time and effort to brute force encrypted data

Question 7

Polyalphabetic ciphers include:

Answer 7

Vignere cipher, running-key cipher (uses a passage in a book), and cipher disk (two disks of the alphabet rotated after letter substitutions change)

Question 8

XSRF/CSRF

Answer 8

Redirects static content to steal info (like banking info). Can be mitigated with CAPTCHA, two-factor auth, or by adding annonce to web requests