Computer Science for IGCSE & O level - Data Transmission (Section 7 - No. 11)
What is the purpose of a 'key' in the encryption process?
To identify the sender of the data.
To convert plaintext to ciphertext and vice versa.
To compress the data.
To ensure data integrity.
Explication
The key is used to scramble (encrypt) and unscramble (decrypt) the data.