GIAC Foundational Cybersecurity Technologies Practice Test

What type of encryption uses the same key for both encryption and decryption?

1. Symmetric encryption

2. Asymmetric encryption

3. Hashing

4. Encryption vs. Decryption

The correct answer is: Symmetric encryption

Symmetric encryption is characterized by the use of a single, shared key for both the processes of encrypting and decrypting data. This means that the same key must be kept secret and secure, as anyone possessing this key can both encrypt and decrypt messages. This method is typically faster and more efficient than asymmetric encryption, which utilizes a pair of keys (a public key for encryption and a private key for decryption). In practice, symmetric encryption is commonly employed in scenarios where secure communication is required, and both parties can maintain the confidentiality of the shared key. Examples of symmetric encryption algorithms include AES (Advanced Encryption Standard) and DES (Data Encryption Standard). Asymmetric encryption, on the other hand, employs two different keys and is designed for scenarios where secure key exchange is crucial. Hashing does not involve encryption and is used to verify data integrity rather than confidentiality. The term "Encryption vs Decryption" does not refer to a specific encryption method but rather describes the fundamental functions involved in the process of securing data. Overall, symmetric encryption is often favored for its speed and efficiency in environments where managing a single key is practical.