Computer Science for IGCSE & O level - Data Transmission (Section 2 - No. 43)
Which of the following is a characteristic of 'symmetric key' encryption?
Uses two different keys for encryption and decryption.
Is generally slower than asymmetric key encryption.
The same key is used for both encryption and decryption.
Provides strong authentication.
Explication
Symmetric key encryption uses the same key for both encrypting and decrypting data.