Practical Cryptography GXPN Practice Questions (Page 10)

Questions 46–48

1. 46foundation · easy

   Which of the following is a characteristic of RSA encryption?

   • AIt uses elliptic curve mathematics to achieve security.
   • BIt is based on the difficulty of factoring large composite numbers.
   • CIt is a symmetric algorithm that uses a shared secret key.
   • DIt is primarily used for hashing data.
   Reveal Solution Discussion Select an answer first
2. 47foundation · easy

   What does a digital signature provide in terms of security?

   • AConfidentiality of the message content
   • BAuthenticity and non-repudiation
   • CData compression for efficient transmission
   • DKey exchange between two parties
   Reveal Solution Discussion Select an answer first
3. 48expert · hard

   A security team is reviewing a custom authentication system that generates session IDs using a linear congruential generator (LCG) seeded with the current timestamp. The session IDs are then hashed with SHA-256 before being sent to clients. Which weakness is most critical?

   • AThe LCG is predictable, allowing an attacker to guess future session IDs.
   • BThe hash reveals the original session ID.
   • CSHA-256 is vulnerable to collision attacks.
   • DThe timestamp seed is too large, causing performance issues.
   Reveal Solution Discussion Select an answer first