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

The correct answer is A. RSA. RSA (Rivest-Shamir-Adleman) is a versatile asymmetric algorithm capable of both encrypting data (using the recipient's public key) and creating digital signatures (using the sender's private key). DES is a symmetric algorithm and supports neither function in the public key…

Submitted by paula_co· Apr 18, 2026Cryptography

Question

Options

ARSA
BDES
CIDEA
DDiffie-Hellman

How the community answered

(45 responses)

A
89% (40)
B
2% (1)
C
2% (1)
D
7% (3)

Explanation

RSA (Rivest-Shamir-Adleman) is a versatile asymmetric algorithm capable of both encrypting data (using the recipient's public key) and creating digital signatures (using the sender's private key). DES is a symmetric algorithm and supports neither function in the public key sense. IDEA is also a symmetric block cipher. Diffie-Hellman is an asymmetric algorithm, but it is a key exchange protocol only - it cannot directly perform encryption or digital signatures. RSA's mathematical properties based on integer factorization enable it to serve all three asymmetric functions: encryption, decryption, and digital signatures.

Topics

#Public Key Cryptography#RSA#Digital Signatures#Asymmetric Encryption

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