Crypto Cracking

Question 1

A ___ ________ is where a copy of the key is kept in escrow for use by a government agent.

Answer 1

Key escrow

Question 2

A _____ backdoor is where it is possible for the government to mathematically break encryption, but no one else can.

Answer 2

NOBUS

Question 3

When an intruder uses brute force to decrypt the

ciphertext and tries every possible key?

Answer 3

Exhaustive search

Question 4

What sort of crypto cracking method involves the intruder knowing part of the ciphertext and the corresponding plaintext, which can then be used to decrypt the rest of the ciphertext?

Answer 4

Known plaintext attack

Question 5

What sort of crypto cracking method involves the intruder sending a message to the target,
which is then encrypted with the target’s private-key and the intruder then analyses the encrypted message?

Answer 5

Chosen ciphertext attack

Question 6

What is the process of systematically entering every word in a dictionary as a password to see if the hashed code matches the one in the password file?

Answer 6

Dictionary attack

Question 7

Which type of attack is a trial-and-error method in which an attacker keeps trying different passwords or passphrases combinations to see if there is a match?

Answer 7

Brute force attack