What is the primary difference between asymmetric and symmetric encryption?

The primary difference between asymmetric and symmetric encryption lies in the number of keys used for encryption and decryption. Asymmetric encryption employs a pair of keys: a public key and a private key. The public key is used to encrypt data, while the corresponding private key is used for decryption. This dual-key mechanism enhances security, enabling functions such as secure key exchange and digital signatures.

In contrast, symmetric encryption utilizes a single key for both encryption and decryption processes. This means that both parties must have a shared secret key, which adds complexity regarding key distribution and management.

Focusing on the other options, while symmetric encryption indeed tends to be faster than asymmetric, that characteristic alone does not encapsulate the primary distinction about the key structure. The statement about asymmetric encryption only being able to encrypt data is incorrect; it can also decrypt data using the private key. Lastly, the idea that symmetric encryption is only used in networking is misleading, as symmetric encryption is widely applicable beyond just networking contexts.