Which type of cryptography is best suited for bulk encryption due to its speed?

Symmetric key cryptography is best suited for bulk encryption due to its speed, which is one of its key advantages. In symmetric encryption, the same key is used for both encryption and decryption processes. This simplicity leads to faster algorithms and lower computational overhead compared to other forms of cryptography, particularly asymmetric or public key cryptography.

Asymmetric cryptography, on the other hand, involves a pair of keys (a public key for encryption and a private key for decryption) which inherently makes it slower than symmetric methods. It is typically used for smaller data sizes, such as securely exchanging symmetric keys, rather than encrypting large volumes of data.

Hashing cryptography serves a different purpose altogether, as it is used to create a fixed-size output (hash) from input data of arbitrary size, primarily employed for data integrity and not for encrypting large datasets.

Therefore, for scenarios requiring the encryption of large amounts of data efficiently, symmetric key cryptography stands out as the most practical and fastest option available.