Choose the password generator that uses a challenge-response method for authentication.
A.
Cryptographic keys
B.
Smart cards
C.
Synchronous password generator
D.
Asynchronous password generator
Explanation:
An synchronous password generator, has an authentication server that generates a challenge (a
large number or string) which is encrypted with the private key of the token device and has that
token device’s public key so it can verify authenticity of the request (which is independent from the
time factor). That challenge can also include a hash of transmitted data, so not only can the
authentication be assured; but also the data integrity.