Which of the following cryptography attack methods is usually performed without the use of a computer?

A ciphertext-only attack is a computational cryptanalytic technique where the analyst uses only intercepted ciphertext to statistically or algorithmically deduce the key or plaintext, requiring a computer.

A chosen key attack is a technical cryptanalytic method in which the attacker studies cipher behavior under controlled key conditions, requiring computational tools and mathematical analysis.

The rubber hose attack involves threatening, coercing, or physically harming a person to compel disclosure of a cryptographic key or passphrase. It requires no computer or mathematical analysis - it exploits the human element as the weakest link, effectively bypassing even mathematically unbreakable encryption by targeting the person who holds the key.

A rainbow table attack uses precomputed hash-to-plaintext lookup tables to reverse password hashes, which requires a computer both to generate the tables and to perform the lookups.