Scrapheap Challenge events. Examples of challenges included making a jet car, a bridging machine, a car-crusher, and a machine to fling a British Leyland Mini as far as possible. Assistant producer Eve Kay had the idea for the show after watching a scene in the movie "Apollo 13", where NASA engineers had only a short period of time to construct a carbon dioxide filter out of parts available on the space capsule. The show also draws its inspiration from the 1980s TV series "The Great Egg Race". The UK show was originally presented by Robert Llewellyn, joined in series 2-4 by producer
Challenge–response authentication Challenge–response authentication In computer security, challenge–response authentication is a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authenticated. The simplest example of a challenge–response protocol is password authentication, where the challenge is asking for the password and the valid response is the correct password. Clearly an adversary who can eavesdrop on a password authentication can then authenticate itself in the same way. One solution is to issue multiple passwords, each of them marked with an identifier. The verifier can ask for any of the passwords, and