Question
Which of the following is public key Crypto system ?
A. RSA
B. Caesar
C. Vernam
D. DES
E. ECC
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A and E only
Public Key Cryptosystems Identification
Public key cryptosystems, also known as asymmetric cryptosystems, use a pair of keys: a public key for encryption and a private key for decryption. Let's analyze the given options:
- RSA: An algorithm for public key cryptography. It is widely used for secure data transmission.
- Caesar Cipher: A simple substitution cipher where each letter is shifted by a fixed number of positions down the alphabet. This is a symmetric encryption method.
- Vernam Cipher: This refers to the one-time pad, a theoretically unbreakable symmetric encryption technique.
- DES (Data Encryption Standard): A symmetric-key algorithm used for encrypting and decrypting sensitive data.
- ECC (Elliptic Curve Cryptography): A public key cryptosystem based on the algebraic structure of elliptic curves over finite fields.
Identifying Asymmetric Systems
Based on the analysis, the public key cryptosystems among the options are:
- RSA (A)
- ECC (E)
Therefore, the correct combination is A and E.
Final Answer Selection
The option that includes both RSA and ECC is Option D.
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