Which type of encryption is typically faster for large files that don't require key transmission?

Symmetric encryption is typically faster for processing large files because it uses the same key for both encryption and decryption. This method is less computationally intensive than asymmetric encryption, which relies on a pair of keys (a public and a private key) and performs more complex mathematical operations.

When dealing with large amounts of data, the speed of encryption and decryption becomes a critical factor. Symmetric encryption algorithms, such as AES (Advanced Encryption Standard), are designed to handle extensive data quickly and efficiently. Additionally, one of the main advantages is that it does not require the overhead of key exchange protocols that asymmetric methods necessitate. In scenarios where secure communication can be established through a pre-shared key or when the context permits safe key sharing, symmetric encryption is the preferred choice for file encryption.

Other encryption methods mentioned may be slower or involve complexities unsuitable for large file handling without the need for key transmission. For instance, while PGP incorporates both symmetric and asymmetric encryption, it typically leads to added overhead due to its reliance on key exchanges. Hash encryption is not an encryption method for confidentiality, but rather for data integrity verification, and is not applicable in the context of encrypting files.