Where does challenge collide?

In cryptography and network security, a challenge is an unpredictable value that a verifier sends to a party claiming an identity, who must return a response computed with a secret they hold, proving who they are without revealing the secret and defeating anyone who merely replays an old message. Needham and Schroeder's 1978 Using encryption for authentication in large networks of computers introduced the authentication protocols built on such fresh, single-use values, now called nonces, that later challenge-response schemes generalise. The referent is a message exchanged between machines to authenticate identity, and it bears no relation to an objection to a juror, a dose given to a sensitized organism, or a demand that stretches an employee.[1]

Unit

One unpredictable value sent by a verifier, answered by one computed response

Recovery means

Not applicable

Measured by

Verified by checking the returned response against the value expected from the shared secret

In organizational psychology, a challenge stressor is a job demand, such as heavy workload, time pressure, or wide responsibility, that employees tend to appraise as an opportunity for mastery and growth rather than a threat. Cavanaugh, Boswell, Roehling, and Boudreau's 2000 An empirical examination of self-reported work stress among U.S. managers drew the line between these challenge demands and hindrance demands that block goals, and LePine, Podsakoff, and LePine's 2005 meta-analysis confirmed that the two kinds relate to motivation and performance in opposite directions. The referent is a work demand and how people appraise it, measured by survey, and it is a different thing entirely from a juror objection, an immune exposure, or a value sent to verify identity.[2][3]

Unit

A job demand rated by employees on how far it promotes growth versus blocks goals

Recovery means

Not applicable

Measured by

Assessed with self-report survey scales that separate challenge demands from hindrance demands