Asymmetric encryption (RSA, ECC) in Cybersecurity - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

How does asymmetric encryption differ from symmetric encryption?

Which statement best explains the key difference between asymmetric and symmetric encryption?

A Asymmetric encryption uses two different keys, while symmetric encryption uses the same key for both encryption and decryption.

B Asymmetric encryption is faster than symmetric encryption because it uses simpler algorithms.

C Asymmetric encryption uses the same key for encryption and decryption, while symmetric encryption uses two different keys.

D Asymmetric encryption does not require keys, while symmetric encryption requires keys.

💡 Hint

Think about how keys are used in each encryption type.

Asymmetric encryption uses a pair of keys: one public and one private. Symmetric encryption uses a single shared key for both encrypting and decrypting data.

📋 Factual

intermediate

Key size comparison between RSA and ECC

Which of the following correctly compares the typical key sizes of RSA and ECC for similar security levels?

A Key size does not affect security in RSA or ECC.

B ECC keys are generally much larger than RSA keys for the same security level.

C RSA and ECC keys are usually the same size for the same security level.

D RSA keys are generally much larger than ECC keys for the same security level.

💡 Hint

Consider which algorithm is known for smaller keys with strong security.

ECC achieves similar security with much smaller key sizes compared to RSA, making RSA keys larger for equivalent security.

🚀 Application

advanced

Choosing encryption for a mobile app

You are designing a mobile app that requires secure communication but has limited processing power and battery life. Which asymmetric encryption method is best suited?

A RSA, because it is widely used and easy to implement.

B Neither RSA nor ECC; symmetric encryption is better for mobile apps.

C ECC, because it provides strong security with smaller keys and less computation.

D Use both RSA and ECC together to maximize security.

💡 Hint

Think about efficiency and resource use on mobile devices.

ECC is preferred for devices with limited resources because it uses smaller keys and requires less processing power than RSA.

🔍 Analysis

advanced

Security risk of private key exposure

What is the main security risk if the private key in an RSA or ECC system is exposed?

A An attacker can decrypt messages meant only for the key owner and can impersonate the owner.

B The public key becomes invalid and cannot be used anymore.

C Only the encrypted messages sent before exposure are at risk, not future messages.

D The encryption algorithm automatically changes keys to prevent risk.

💡 Hint

Consider what the private key controls in asymmetric encryption.

The private key is secret and used to decrypt messages and create digital signatures. Exposure allows attackers to read messages and impersonate the owner.

❓ Reasoning

expert

Why is ECC preferred over RSA in modern cryptography?

Which reason best explains why ECC is increasingly preferred over RSA in modern cryptographic systems?

A ECC is easier to implement correctly than RSA, reducing programming errors.

B ECC offers equivalent security with smaller keys, leading to faster computations and lower power consumption.

C RSA keys are no longer secure against modern attacks, while ECC keys are unbreakable.

D ECC does not require a private key, simplifying key management.

💡 Hint

Think about efficiency and security trade-offs in cryptography.

ECC provides strong security with smaller keys, which means faster processing and less power use, making it ideal for modern devices and applications.