Scrapheap Challenge last minute when one team couldn't travel due to a livestock epidemic. Both US teams made it to the final round. Series 9 was shown in two halves. The first eight episodes aired between 15 April and 3 June, and the remaining episodes between 4 November and 23 December 2007. Series 11 saw Dick Strawbridge (formerly a competitor from series 1-3) return as an expert and judge, replacing Robert Llewellyn. The show was now produced by RDF Bristol and Exec. producer Jane Lomas and series producer John Macnish had to deliver the new series on a fraction of the budget
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