CISSP-ISSAP · Question #100
Which of the following encryption methods comes under symmetric encryption algorithm? Each correct answer represents a complete solution. Choose three.
The correct answer is A. DES B. Blowfish C. RC5. DES, Blowfish, and RC5 are all symmetric encryption algorithms - they use a single shared key for both encryption and decryption. DES (Data Encryption Standard) is a classic 56-bit block cipher, Blowfish is a flexible block cipher with variable key lengths, and RC5 is a…
Question
Which of the following encryption methods comes under symmetric encryption algorithm? Each correct answer represents a complete solution. Choose three.
Options
- ADES
- BBlowfish
- CRC5
- DDiffie-Hellman
How the community answered
(49 responses)- A92% (45)
- D8% (4)
Explanation
DES, Blowfish, and RC5 are all symmetric encryption algorithms - they use a single shared key for both encryption and decryption. DES (Data Encryption Standard) is a classic 56-bit block cipher, Blowfish is a flexible block cipher with variable key lengths, and RC5 is a parameterized block cipher designed by Ron Rivest, all operating on the same shared-secret model.
Diffie-Hellman (D) is the distractor: it is an asymmetric key exchange protocol, not an encryption algorithm. Its purpose is to securely establish a shared secret over an insecure channel using public/private key pairs - it does not encrypt data directly.
Memory tip: Think "DES, Blowfish, RC5 = Same key, Same side" - symmetric means both parties share one key. Diffie-Hellman stands apart because it's about exchanging keys between two parties, which is the hallmark of asymmetric (public-key) cryptography.
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