Which cryptographic algorithm is an asymmetric (public-key) cipher commonly used for secure key exchange and digital signatures?
Answer and explanation
Correct answer: D. RSA
- Step 1: Distinguish symmetric from asymmetric cryptography.
- Step 2: RSA (Rivest-Shamir-Adleman) relies on the mathematical difficulty of factoring large composite prime products, using a mathematically paired public and private key (asymmetric).
Answer
RSA.
Why not the others: AES-256, DES, and Blowfish are symmetric block ciphers that share a single private secret key for both encryption and decryption.
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