ITN 262 UPDATED EXAMINERS SET QUESTIONS
AND ANSWERS SURE A+
✔✔Kevin wants to attack Bob's computing resources. He is motivated at the "stealth"
level. Which of the following attacks might Bob face? - ✔✔Borrow Bob's one-time
password token
Search for written copies of Bob's passwords
✔✔Section 6.1.2 describes doorknob-rattling attacks. This is most similar to which of
the following attacks? - ✔✔Trial and error
✔✔In a password system, increasing the work factor results in which of the following?
Select all that apply. - ✔✔Increases the size of the character set from which users
choose passwords
Increases the length of the password
✔✔Which of the following most effectively resists a trial-and-error guessing attack? All
sizes are in terms of decimal digits. - ✔✔A passive authentication token with a 9-digit
base secret
, ✔✔Here is a list of features of various authentication tokens. Indicate all that are true for
one-time password tokens. - ✔✔Some tokens use a built-in counter to generate nonces
The token contains a base secret.
Some tokens use a built-in clock to generate nonces.
✔✔Bob lives at home during the summer. His little brother, Tom, is fascinated by
computers and with everything his big brother does. Tom loves to watch Bob log in to
his summer job's remote site and do things. Tom often goes into Bob's room and looks
through his things. Given this, which authentication technique—by itself—resists the risk
of Tom masquerading as Bob? - ✔✔A memorized, hard-to-guess password
✔✔Which of the following authentication techniques are vulnerable to sniffing attacks
that replay the sniffed credential? Select all that apply. - ✔✔Passwords
Passive Tokens
Biometric Readers
✔✔Encryption protects information by presenting which of the following? - ✔✔Key
✔✔The type of cipher that rearranges the text of a message is called: - ✔✔transposition
✔✔Which decryption procedure requires two inputs? Select all that apply. - ✔✔-A key
-Ciphertext
✔✔Bob and Kevin are both using crypto to communicate with other people. Bob doesn't
want Kevin eavesdropping on his messages, and vice versa. They each need to choose
algorithms and keys. Which of the following choices will protect one from eavesdropping
by the other? Select all that apply. - ✔✔-Use different algorithms and different keys.
-Use the same algorithm and different keys.
✔✔The phrases below describe cryptanalysis techniques. Match the technique with its
description.
Known Plaintext
Chosen Plaintext
Known Ciphertext - ✔✔- analyst has both plaintext & ciphertext
- analyst can select plaintexts to be encrypted with targets secret key and has access
to ciphertext
- analyst works with ciphertext only
✔✔DES was unveiled in what year? - ✔✔1975
AND ANSWERS SURE A+
✔✔Kevin wants to attack Bob's computing resources. He is motivated at the "stealth"
level. Which of the following attacks might Bob face? - ✔✔Borrow Bob's one-time
password token
Search for written copies of Bob's passwords
✔✔Section 6.1.2 describes doorknob-rattling attacks. This is most similar to which of
the following attacks? - ✔✔Trial and error
✔✔In a password system, increasing the work factor results in which of the following?
Select all that apply. - ✔✔Increases the size of the character set from which users
choose passwords
Increases the length of the password
✔✔Which of the following most effectively resists a trial-and-error guessing attack? All
sizes are in terms of decimal digits. - ✔✔A passive authentication token with a 9-digit
base secret
, ✔✔Here is a list of features of various authentication tokens. Indicate all that are true for
one-time password tokens. - ✔✔Some tokens use a built-in counter to generate nonces
The token contains a base secret.
Some tokens use a built-in clock to generate nonces.
✔✔Bob lives at home during the summer. His little brother, Tom, is fascinated by
computers and with everything his big brother does. Tom loves to watch Bob log in to
his summer job's remote site and do things. Tom often goes into Bob's room and looks
through his things. Given this, which authentication technique—by itself—resists the risk
of Tom masquerading as Bob? - ✔✔A memorized, hard-to-guess password
✔✔Which of the following authentication techniques are vulnerable to sniffing attacks
that replay the sniffed credential? Select all that apply. - ✔✔Passwords
Passive Tokens
Biometric Readers
✔✔Encryption protects information by presenting which of the following? - ✔✔Key
✔✔The type of cipher that rearranges the text of a message is called: - ✔✔transposition
✔✔Which decryption procedure requires two inputs? Select all that apply. - ✔✔-A key
-Ciphertext
✔✔Bob and Kevin are both using crypto to communicate with other people. Bob doesn't
want Kevin eavesdropping on his messages, and vice versa. They each need to choose
algorithms and keys. Which of the following choices will protect one from eavesdropping
by the other? Select all that apply. - ✔✔-Use different algorithms and different keys.
-Use the same algorithm and different keys.
✔✔The phrases below describe cryptanalysis techniques. Match the technique with its
description.
Known Plaintext
Chosen Plaintext
Known Ciphertext - ✔✔- analyst has both plaintext & ciphertext
- analyst can select plaintexts to be encrypted with targets secret key and has access
to ciphertext
- analyst works with ciphertext only
✔✔DES was unveiled in what year? - ✔✔1975
