Discussion
Which type of encryption is preferred to encrypt the data stored on a conventional hard-disk ?
Answer: A
Symmetric-key cryptography is preferred.
Disk encryption has to encrypt and decrypt large volumes of data quickly, on every read and write. Symmetric ciphers such as AES do this efficiently and are what full-disk encryption systems use, with the same key used to encrypt and decrypt.
Asymmetric cryptography is far slower and is used for key exchange and digital signatures, not bulk data (at most it protects the symmetric key). Hashing is one-way, so data hashed could never be read back. Quantum cryptography concerns key distribution over communication channels, not data at rest.
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