Question:
Which of the following is public key crypto system? A. RSA,
B. Caesar,
C. Vernam,
D. DES,
E. EC
C.
Which of the following is public key crypto system? A. RSA,
B. Caesar,
C. Vernam,
D. DES,
E. EC
C.
B. Caesar,
C. Vernam,
D. DES,
E. EC
C.
Show Hint
RSA and ECC are public key cryptosystems, while DES is a symmetric key cryptosystem.
Updated On: Jun 6, 2026
- A and D only
- B and C only
- B and D only
- A and E only
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Public key cryptography uses two keys: a public key and a private key.
Step 1: Check RSA.
RSA is a public key cryptosystem. \[ A \text{ is correct} \]
Step 2: Check ECC.
ECC stands for Elliptic Curve Cryptography. It is also a public key cryptosystem. \[ E \text{ is correct} \]
Step 3: Check Caesar, Vernam and DES.
Caesar cipher and Vernam cipher are symmetric or classical encryption methods. DES is also symmetric key encryption. Therefore, public key cryptosystems are: \[ A \text{ and } E \] \[ \therefore \text{Correct Answer is (D)} \]
Public key cryptography uses two keys: a public key and a private key.
Step 1: Check RSA.
RSA is a public key cryptosystem. \[ A \text{ is correct} \]
Step 2: Check ECC.
ECC stands for Elliptic Curve Cryptography. It is also a public key cryptosystem. \[ E \text{ is correct} \]
Step 3: Check Caesar, Vernam and DES.
Caesar cipher and Vernam cipher are symmetric or classical encryption methods. DES is also symmetric key encryption. Therefore, public key cryptosystems are: \[ A \text{ and } E \] \[ \therefore \text{Correct Answer is (D)} \]
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