Which one of the following defines APIs for devices such as smart cards that contain cryptographic information?
a. PKCS #11
b. PKCS #13
c. PKCS #4
d. PKCS #2
Answer: A
PKCS #11, the Cryptographic Token Interface Standards, defines an API named Cryptoki for devices holding cryptographic information. Answer B is incorrect because PKCS #13 is the Elliptic Curve Cryptography (ECC) standard. Both answers C and D are incorrect because PKCS #4 and PKCS #2 no longer exist and have been integrated into PKCS #1, RSA Cryptography Standard.