What role does the trusted third party serve in public-key certificates? Select all that
apply.
Give this one a try later!
a) Signs public-key certificates using its private key
b) Publishes its own public key so others can use it to verify the certificates
it issues
The phrases below describe situations in which RSA is vulnerable to attack. Match the
attack with the method of use of RSA.
Give this one a try later!
, Timing attack
Correct match:
Accurately measuring how long it takes to decrypt an RSA-encrypted
message provides information about the private key value
Small plaintext attack
Correct Answer:
If the public key value is 3 and the message length is less than one-third the
length of the modulus N, a shortcut attack can recover the message
Small private key attack
Correct Answer:
If the private key d value is relatively small, there is a mathematical shortcut
for recovering it
Which of the following can help to avoid problems with reused encryption keys?
Select all that apply.
Give this one a try later!
d) Combine the key with a nonce
c) Change the internal key
What RSA attack relies on mathematical test to reduce the risk that the chosen
number isn't really a prime number?
Give this one a try later!
b) Bogus primes
Encrypting an encryption key using a passphrase is called:
apply.
Give this one a try later!
a) Signs public-key certificates using its private key
b) Publishes its own public key so others can use it to verify the certificates
it issues
The phrases below describe situations in which RSA is vulnerable to attack. Match the
attack with the method of use of RSA.
Give this one a try later!
, Timing attack
Correct match:
Accurately measuring how long it takes to decrypt an RSA-encrypted
message provides information about the private key value
Small plaintext attack
Correct Answer:
If the public key value is 3 and the message length is less than one-third the
length of the modulus N, a shortcut attack can recover the message
Small private key attack
Correct Answer:
If the private key d value is relatively small, there is a mathematical shortcut
for recovering it
Which of the following can help to avoid problems with reused encryption keys?
Select all that apply.
Give this one a try later!
d) Combine the key with a nonce
c) Change the internal key
What RSA attack relies on mathematical test to reduce the risk that the chosen
number isn't really a prime number?
Give this one a try later!
b) Bogus primes
Encrypting an encryption key using a passphrase is called:
