In the field of cryptanalysis, what is meant by a "rubber-hose" attack?

Attempting to decrypt ciphertext by making logical assumptions about the original content describes a known-plaintext or probable-plaintext attack, which is a technical form of cryptanalysis.

A 'rubber-hose' attack is a non-technical form of cryptanalysis that involves extracting cryptographic secrets, such as keys or passphrases, from an individual through physical coercion, intimidation, or torture, bypassing the technical strength of cryptography by targeting the human element.

Forcing a key stream through a hardware-accelerated device refers to technical methods like brute-force attacks or side-channel analysis, not a physical attack against a human.

A backdoor placed into a cryptographic algorithm by its creator is a form of design vulnerability or kleptography, which is a different concept from a rubber-hose attack.