PGP Overview and Key Concepts Answers 1. What is the primary purpose of PGP in communication? A. To reduce file sizes for emails B. To improve internet speed C. To ensure confidentiality, integrity, and authenticity D. To provide real-time communication Answer: To ensure confidentiality, integrity, and authenticity (C) PGP is primarily used to ensure that messages can be kept confidential, remain intact, and confirm the identity of the sender. 2. Which type of cryptography uses the same key for both encryption and decryption? A. Hashing algorithms B. Symmetric-key cryptography C. Asymmetric cryptography D. Public-key cryptography Answer: Symmetric-key cryptography (B) Symmetric-key cryptography employs the same key for encrypting and decrypting data, making it efficient for large data. 3. Which algorithm is commonly used by PGP for creating digital signatures? A. RSA B. AES C. Twofish D. Blowfish Answer: RSA (A) PGP utilizes RSA as a widely employed algorithm for creating digital signatures and facilitating key exchange. 4. What role do hashing algorithms play in PGP? A. They encrypt emails and files B. They manage the encryption keys C. They create unique fingerprints for data D. They generate public keys Answer: They create unique fingerprints for data (B) Hashing algorithms generate a unique fingerprint which is critical for verifying the integrity of data. 5. What is a significant challenge associated with the use of PGP? A. High encryption speeds B. Unlimited data storage C. Lack of email compatibility D. Implementation complexity Answer: Implementation complexity (D) Implementation complexity can make it difficult for users to properly configure and use PGP. 6. Which aspect of key management is crucial for secure communication in PGP? A. Creating several public keys for each user B. Generating, storing, and managing keys securely C. The speed of key generation D. Public-key distribution without encryption Answer: Generating, storing, and managing keys securely (B) Effective key management involves ensuring that keys are generated, stored, and managed in a secure manner. 7. What is the use of digital signatures in PGP? A. To modify the content of messages B. To verify the sender's identity and maintain message integrity C. To compress data for faster transmission D. To encrypt message contents Answer: To verify the sender's identity and maintain message integrity (B) Digital signatures serve to confirm the identity of the sender and ensure the message has not been altered. 8. Which of the following is a potential limitation of algorithms used in PGP? A. They exclusively support text data B. They may have algorithmic weaknesses C. They can only handle large datasets D. They require excessive computational power Answer: They may have algorithmic weaknesses (B) Algorithmic weaknesses can significantly impact the overall security and resilience of the PGP system.