A public key algorithm that does both encryption and digital signature is which of the following?

A.
RSA

B.
DES

C.
IDEA

D.
DSS

Explanation:
“RSA, named after its inventors Ron Rivest, Adi Shamir, and Leonard Adleman, is a
public key algorithm that is the most popular when it comes to asymmetric algorithms. RSA is a
worldwide de facto standard and can be used for digital signatures, key exchange, and
encryption.”
Pg. 489 Shon Harris: All-In-One CISSP Certification Exam Guide