IT3182 Cryptology and Network Security Midterm Exam

A company wants to ensure that only authorized users can access its internal communication. Which cryptographic objective does this scenario represent?

• Authentication

• Confidentiality

• Non-repudiation

• Integrity

Alice sends Bob a message encrypted with Bob's public key. What type of encryption is used?

• Symmetric

• Asymmetric

• Hashing

• One-time pad

A hacker attempts to alter an online transaction. Which cryptographic property prevents this?

• Confidentiality

• Authentication

• Integrity

• Non-repudiation

Which of the following encryption methods is considered insecure today?

• AES

• RSA

• DES

• ECC

Which algorithm is best suited for digital signatures due to its small key size and strong security?

• AES

• ECC

• DES

• Blowfish

A banking application needs encryption that balances security and performance. Which algorithm is the best choice?

• RSA

• AES

• MD5

• SHA-1

The Caesar cipher is an example of which type of encryption?

• Transposition

• Hashing

• Substitution

• Asymmetric

Which modern encryption technique uses a pair of public and private keys?

• DES

• AES

• RSA

• MD5

If a cryptographic system allows a sender to prove they sent a message, which property is satisfied?

• Confidentiality

• Authentication

• Non-repudiation

• Integrity

What is the primary weakness of MD5 as a cryptographic hash function?

• Too slow

• Collisions can be found

• Requires a public key

• Produces variable-length output