Where does malleability collide?

In materials science, malleability is a metal's ability to be permanently deformed under compression, as in hammering or rolling into sheets, without cracking, a property rooted in how its crystal planes slip past one another. Anderson's 1869 Malleability and ductility of metals discussed how metals like gold and lead can be worked into thin forms, distinguishing this capacity to spread under a blow from ductility, the capacity to be drawn into wire. The referent is a mechanical property of a solid, measured in the workshop and the lab, and it is unrelated to a pliable memory or a transformable ciphertext beyond the shared idea of something that can be reshaped.[1]

Unit

The degree of permanent deformation under compression a material withstands before cracking

Recovery means

Not applicable

Measured by

Assessed by workability tests such as rolling or forging to thin gauges and by the strain a material tolerates before fracture

In cognitive psychology, malleability refers to how a memory is not a fixed recording but can be altered by information encountered after the event, including the very wording of a question. Loftus and Palmer's 1974 Reconstruction of automobile destruction found that asking how fast cars were going when they "smashed" versus "hit" each other changed speed estimates and later made witnesses more likely to report broken glass that was never there. The referent is the reconstructive, suggestible nature of human memory, studied through experiment, and it has nothing to do with a metal's workability or a cipher's transformability beyond the shared meaning of being reshapeable.[2]

Unit

The extent to which later information alters what a person recalls

Recovery means

Not applicable

Measured by

Demonstrated experimentally by manipulating post-event information and measuring shifts in subsequent recall

In cryptography, malleability is the property that an attacker can transform a ciphertext into another valid ciphertext whose plaintext is meaningfully related to the original, without ever decrypting it; non-malleability is the security goal of ruling this out. Dolev, Dwork, and Naor's 2000 Nonmalleable cryptography formalised the requirement that seeing a ciphertext gives no help in producing a ciphertext of a related message, which matters for bids, votes, and payments. The referent is a security property of an encryption or commitment scheme, defined and proved formally, distinct from a metal's workability or a memory's suggestibility despite sharing the word.[3]

Unit

Whether a valid ciphertext of a related message can be produced from a given one

Recovery means

Not applicable

Measured by

Established by formal non-malleability definitions and reduction-based proofs that related-message ciphertexts cannot be forged