Exam 312-50v13 topic 1 question 160 discussion

Actual exam question from ECCouncil's 312-50v13

Question #: 160
Topic #: 1

You are a cybersecurity professional managing cryptographic systems for a global corporation. The company uses a mix of Elliptic Curve Cryptography (ECC) for key exchange and symmetric encryption algorithms for data encryption. The time complexity of ECC key pair generation is O(n^3), where 'n' is the size of the key. An advanced threat actor group has a quantum computer that can potentially break ECC with a time complexity of O((log n)^2). Given that the ECC key size is 'n=512' and varying symmetric encryption algorithms and key sizes, which scenario would provide the best balance of security and performance?

A. Data encryption with AES-128: Provides moderate security and fast encryption, offering a balance between the two.
B. Data encryption with AES-256: Provides high security with better performance than 3DES, but not as fast as other AES key sizes.
C. Data encryption with 3DES using a 168-bit key: Offers high security but slower performance due to 3DES's inherent inefficiencies.
D. Data encryption with Blowfish using a 448-bit key: Offers high security but potential compatibility issues due to Blowfish's less widespread use.

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Suggested Answer: B 🗳️

by Dogeo at Feb. 13, 2025, 12:28 p.m.

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killwitch

1 month ago

Selected Answer: B

Since quantum computers can break ECC much more efficiently due to its O((log n)^2) time complexity, the focus should be on strong symmetric encryption that is resistant to quantum attacks. AES-256 is widely recommended for post-quantum security because: - It offers high security against both classical and quantum attacks. - Grover's algorithm reduces the effective key space of AES-256 to AES-128 security levels, but that is still secure. - AES-256 is much faster than 3DES and Blowfish while maintaining strong security.

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Gibsomd

1 month ago

Selected Answer: B

AES (Advanced Encryption Standard), is not directly broken by quantum computing in the same way as ECC. Instead, Grover’s algorithm can reduce brute-force attacks on AES from O(2^k) to O(2^(k/2)), meaning AES-256 has an effective strength of 128-bit security against quantum attacks.

upvoted 2 times

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Dogeo

2 months ago

Selected Answer: A

AES-128 is the best for balance between security and performance.

upvoted 1 times

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Exam 312-50v13 topic 1 question 160 discussion

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