Computer Science for IGCSE & O level - Data Transmission (Section 5 - No. 17)
What is the main security risk associated with using symmetric encryption?
The same key is used for both encrypting and decrypting, which can make it difficult to share the key securely.
The encryption process takes too long.
The encryption algorithm is too complex.
The encryption key cannot be changed.
Explication
The main risk with symmetric encryption is the secure distribution of the shared key, since if the key is compromised, all encrypted data is at risk.