Introduction to Cryptography

What is the primary goal of cryptography?

• To hide data from unauthorized parties

• To compress data for efficient storage

• To increase data transfer speed

• To enhance data availability

Which cryptographic technique uses a single key for both encryption and decryption?

• Asymmetric encryption

• Symmetric encryption

• Hashing

• Digital signatures

Which of the following is NOT a commonly used cryptographic algorithm?

• AES (Advanced Encryption Standard)

• RSA (Rivest-Shamir-Adleman)

• MD5 (Message Digest Algorithm 5)
  

• JPEG (Joint Photographic Experts Group)

Which of the following is a characteristic of a strong cryptographic algorithm?

• It is widely known and openly published

• It relies on security through obscurity

• It requires frequent key changes for effectiveness

• It can be easily decrypted using basic computing power

Which type of attack involves trying every possible key until the correct one is found?

• Dictionary attack

• Brute-force attack

• Rainbow table attack

• Man-in-the-middle attack

What is the purpose of a digital signature in cryptography?

• To encrypt data for secure transmission

• To hide the contents of a message from unauthorized users

• To generate random keys for encryption

• To verify the authenticity and integrity of a message

Which cryptographic protocol is commonly used to secure internet communication, such as web browsing?

• SSL (Secure Sockets Layer)

• SMTP (Simple Mail Transfer Protocol)

• FTP (File Transfer Protocol)

• DHCP (Dynamic Host Configuration Protocol)

Which statement best describes symmetric encryption?

• It uses two different keys for encryption and decryption

• It is generally slower compared to asymmetric encryption

• It is also known as public-key cryptography

• It uses the same key for both encryption and decryption

What distinguishes asymmetric encryption from symmetric encryption?

• Asymmetric encryption is faster than symmetric encryption

• Asymmetric encryption uses the same key for both encryption and decryption

• Asymmetric encryption is more secure for key exchange

• Asymmetric encryption requires a secret key shared between communicating parties

The objectives of Cryptography

• Data integrity

• Authentication

• Non-radiation

• Non-repudiation