🛡️ Test question: Understanding Cryptographic Algorithms for Internet Security

🛡️ Understanding Cryptographic Algorithms for Internet Security

(CISSP Domain 3: Security Architecture and Engineering)

🧪 CISSP Practice Question

Which of the following is a cryptographic algorithm that is commonly used for secure communications over the internet?
A: RSA ✅
B: Blowfish
C: Triple DES
D: AES ❌

✅ Correct Answer: A — RSA

CISSP Domain 3: Security Architecture and Engineering

RSA (Rivest-Shamir-Adleman) is an asymmetric cryptographic algorithm used extensively in secure communications, particularly within:

  • TLS/SSL protocols

  • Public key infrastructure (PKI)

  • Digital signatures and certificates

RSA enables the secure exchange of symmetric keys between a client and server, which is the backbone of how secure sessions are established on the internet (e.g., HTTPS).

🔑 In CISSP terms, RSA supports the confidentiality, integrity, and authentication pillars of cryptographic design.

❌ Why the Other Options Are Incorrect

B: Blowfish

CISSP Domain 3

  • Symmetric cipher

  • Designed in the 1990s

  • 64-bit block size, making it susceptible to modern attacks

  • Largely replaced by AES and not typically used in internet protocols anymore

C: Triple DES (3DES)

CISSP Domain 3

  • Based on DES, applying encryption three times

  • Slow and less secure due to small 64-bit block size

  • Deprecated by NIST, scheduled for full disallowance in federal systems

D: AES

CISSP Domain 3

  • Symmetric algorithm

  • Used for bulk data encryption after a secure session is established

  • Not typically used for key exchange, which is what the question focuses on

🧠 Domain 3: Key CISSP Concepts Reinforced

Concept Explanation
Asymmetric vs. Symmetric RSA (asymmetric) is used to securely exchange keys; AES (symmetric) is used for fast, ongoing encryption.
TLS/SSL TLS uses RSA or Diffie-Hellman for key exchange and AES for encryption.
Cryptographic Lifecycle Knowing when to use each type of crypto is essential for system design and risk mitigation.

✍️ Memory Hack

🔐 RSA = "Really Secure Access" — use it to start a secure conversation
🔒 AES = "Already Established Session" — used after the handshake

📚 CISSP Domain Reference Summary

  • Domain 3: Security Architecture and Engineering
    Covers the design, implementation, and management of secure architectures including cryptographic systems and protocols.

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