Encryption and Decryption Quiz: Test Your Cybersecurity Knowledge

📚 Quick Study Guide

• 🔑 Encryption: The process of converting readable data (plaintext) into an unreadable format (ciphertext) to protect its confidentiality.
• 🛡️ Decryption: The reverse process of encryption, converting ciphertext back into plaintext.
• 🧮 Caesar Cipher: A simple substitution cipher where each letter in the plaintext is shifted a certain number of positions down the alphabet.
• 🔒 Symmetric-key Encryption: Uses the same key for both encryption and decryption (e.g., AES, DES).
• 🔓 Asymmetric-key Encryption: Uses a pair of keys: a public key for encryption and a private key for decryption (e.g., RSA).
• 🔑 Key Length: The size of the encryption key, usually measured in bits. Longer key lengths generally provide stronger security.
• 📝 Hashing: A one-way function that creates a fixed-size string (hash) from an input. Used for verifying data integrity.

🧪 Practice Quiz

1. Which of the following is the process of converting plaintext into ciphertext?
   1. Encryption
   2. Decryption
   3. Hashing
   4. Compression
2. What type of encryption uses the same key for both encryption and decryption?
   1. Asymmetric-key encryption
   2. Symmetric-key encryption
   3. Two-factor encryption
   4. Triple encryption
3. Which of the following algorithms is an example of symmetric-key encryption?
   1. RSA
   2. Diffie-Hellman
   3. AES
   4. ECC
4. What is the purpose of decryption?
   1. To convert ciphertext into plaintext
   2. To convert plaintext into ciphertext
   3. To generate a hash value
   4. To compress data
5. Which of the following is a one-way function used for verifying data integrity?
   1. Encryption
   2. Decryption
   3. Hashing
   4. Compression
6. In asymmetric-key encryption, which key is used to encrypt the data?
   1. Private key
   2. Public key
   3. Session key
   4. Secret key
7. What does key length primarily affect in encryption?
   1. Encryption speed
   2. Decryption speed
   3. Security strength
   4. Data size